The site where they are sourcing the Windows ISO from seems sketchy, but apparently is legit...?  
I guess the site is just an index of Microsoft hosted ISOs, so they are just providing a UI to generate the correct link, and you can check the link is actually going to Microsoft servers before downloading.
 - https://uup.rg-adguard.net/
 - https://www.ghacks.net/2017/03/13/adguard-website-download-w...
It's also important to point out Insider builds are free for use, with some restrictions, providing a cheap alternative. 
You can just use a "rogue" KMS server to activate Windows with no risks for you. For example, as an admin: slmgr /skms kms.digiboy.ir
Which gets to the complicated part of the question in that this is the licensing for OEMs. Running Windows 10 on an RPi as a "consumer" that isn't an OEM (and isn't building/reselling devices) is an interesting question.
Though as a consumer, Windows 10 is also weirdly "shareware" these days in that it's not entirely that mean in what features it disables (versus say XP almost not working at all) when not activated and will happily explain in the Microsoft Store how much it costs to activate and let you buy it there. (Example: https://www.windowscentral.com/you-do-not-need-activate-wind...)
Also even in the US, if you're a home user there's no real concern. I wouldn't run a business on resold keys but I'd certainly use them for home if I needed one.
That's an odd argument. Software has to cost less than the hardware that runs it? When you can get computers for $35 or less, that doesn't leave much of a margin.
For $154 you can get a lot more computer with linux. The implication is that for cheap hardware only very cheap software is competitive because people willing to pay that much money would be better spending it on a better computer.
The unit cost of duplicating software is so close to zero that it might as well be zero and people are willing to give away great software so selling it becomes a challenge.
Although I totally agree with you for that price you can get also get far more computer with Windows! Refurbished Intel machines with a windows 10 home license can be had all day long for $89+.
From where? Honestly curious. (I don't need state-of-the-art, and I'm a cheapskate, so...)
I bought a C2 Duo laptop in 2015 for $AU50 with a 3 month warranty and did the Windows 7 -> 10 upgrade. Earmuffs if you can't stand the fan noise. :)
I'm sitting in front of an 8 year old PC with a quad core, 2.4GHz intel cpu with 8GHz of RAM. It will run rings around any raspberry pi. I use linux machines for work all day long and my home pc for all my personal use. I had one hard drive die a couple years back, but that has nothing to do with the OS. That is all the data loss I've had in 25 years of using PCs. No viruses, and BSOD's are a distant memory (BTW, the linux machines at work crash sometimes too).
- Objectively if you you $150 to spend then spending $112 on the OS leaves you so objectively worse off than spending $0 that its hard to justify the retail cost of a windows license even if you prefer the windows environment. In essence the claim is that windows isn't so much better than pi + windows is better than 5x the computer + linux. Microsoft agrees which is why device makers for cheap devices have historically been able to get a lower per unit than for more fully loaded devices even if the windows sku they shipped with was a less featureful version.
You can't get an acceptable desktop machine for $89 to compare to your $35 rasberry pi. Such a machine will likely be underpowered, it will use 30x as much power, and it will be more likely to die relatively quickly.
Average hard drive lifespan is 3-5 years of use if I recall correctly. Many drives especially if used relatively less may in fact last longer but the average user is less likely to experience hard drive failure insofar as they trash the entire computer before it fails or in fact HAVE experienced it but in fact experience it as "my computer doesn't work anymore" rather than specifically understanding which component failed. Especially if by the time it fails a new machine is objectively desirable.
If you buy an 8 year old machine it would be remarkable if it lasted more than 2 years more during which it would have been liable to use $80 more electricity based on 20 hours of weekly usage.
In brief if you spend $170 and find some dude on craigslist with a particularly good deal you might be able to have a slightly worse or slightly better experience than someone with $35 in their pocket can have any day of the week and twice on sunday.
In short people buying small cheap computers like the pi aren't just too stupid to use craigslist they are making an objective choice with reasonable tradeoffs.
And tasty_freeze isn't the one who made the $89-154 claim. tasty_freeze's claim is that 8-year-old machines work fine, and don't lose data (much).
System: Window 10 Pro
Processor: Intel(R) Pentium(R) CPU G840 @ 2.80 GHz
It's 6 years old dual core slow hard drive and runs like a dog. You could use the extra money to buy a small ssd instad...
I assume you mean GB, right?
Windows 10 on ARM64 devices can run x86 applications. This  video on Channel 9 seems to cover it pretty well.
 - https://channel9.msdn.com/Events/Build/2017/P4171
Also, this is recent builds of Windows 10 on ARM that includes the x86 emulator to run a ton of traditional x86 Windows software.
(Not far from here is the rabbit hole of folks installing these same Windows 10 on ARM builds on Microsoft's Lumia 950 and 950 XL hardware. One such video I saw showed someone running Steam on it to grab and play Fallout 1.)
That said, it seems unpowered for general usage. Perhaps MS might look at officially supporting sub-$US100 SBCs such as ROCKPro64.
If you're going to try this, try on devices you don't care about. Or spend innumerable hours auditing code.
Pass -- for now.
Edit: perhaps you misunderstood - I didn't take keys that were licensed for university owned machines, I got a key that was given to students for their personal devices as part of some agreement with microsoft.
Although I have no qualms about actually pirating windows either ever since they started pushing advertising into the start menu.
Win 10 Specs:
Processor: 1 gigahertz (GHz) or faster processor or SoC.
RAM: 1 gigabyte (GB) for 32-bit or 2 GB for 64-bit.
Hard disk space: 16 GB for 32-bit OS 20 GB for 64-bit OS.
Graphics card: DirectX 9 or later with WDDM 1.0 driver.
Ras Pi 3:
CPU: 4× ARM Cortex-A53, 1.2GHz.
GPU: Broadcom VideoCore IV.
RAM: 1GB LPDDR2 (900 MHz)
Networking: 10/100 Ethernet, 2.4GHz 802.11n wireless.
Bluetooth: Bluetooth 4.1 Classic, Bluetooth Low Energy.
That's Model B, the Model B+ specs are a little bit better. But still only 1GB of RAM which I suspect to be the biggest bottleneck here. Storage also maybe but the Pi can boot from USB nowadays which might bring it to a good enough level.
Comparable to a Raspberry Pi 3, I believe.
Cortex-A53 is an ultra low power, tiny core. It's okay for an embedded toy, it's miserable for a real computer. You really really want at least a Cortex-A72.
You could actually run Windows on Raspberry Pi 3 for a while now, I think it just was just a beta image or something. I'm not entirely sure, but I know I was able to install Windows IoT core on my Pi 3B.
From what I understand, now you can run full windows. Although I’m curious how well it runs
I might give this a try one day when I have time.
Wasn't Eben hinting at something last week?
They should. Plain and simple.
While I personally hate using Windows, I have been trying to get family members to update their machines from Windows Vista, and they won't because "new machines are too expensive and their computer works fine", and despite my best efforts, I cannot get said family members to let me install a Linux on there.
A Raspberry Pi is cheap enough that I might be able to swing them to using something a bit more modern.
EDIT: Not 100% sure why I'm being downvoted for this. Clearly I didn't realize how slow Windows would be.
More like the right desktop to make a patient person desperate
The original Pi was just a little too underpowered to use as a desktop. You could get Chromium to start, but it would be swapping almost instantly and slow to an absolute crawl. The Model 3 has just enough oomph to do basic web browsing or run Libreoffice. It can open Facebook, although you probably don't want Libreoffice open at the same time if you do.
I've found Windows 10 to be slow on more capable machines (older low end laptops mostly), especially ones with spinning hard drives, so I'm somewhat dubious about using it on a Raspberry Pi.