I just want to note that as a developer you can run any code you want on your iPhone through XCode for free. You just can't distribute it in the App Store without a license ($100 a year). You can distribute the code though, and users can compile and install it. This is how Kodi distributes on Apple platforms.
This is a newish change though, within the last couple of years.
You can run any code you want on your iPhone through XCode for free as long as you have a Mac, which is much more expensive than the app store license.
Buy? I've never seen anything to suggest that special entitlements from Apple (KEXT signing on Mac, Network Extension usage on iOS, etc.) requires any payment besides the $100/yr developer program fee
Please correct me if I'm wrong, but I was under the impression you would then be required to reinstall each app every 7 days. In addition, I've read online claims that they limit you to something like 3 App IDs per week on a personal account.
Doesn't mean you have to reinstall all your apps every week?
This is a newish change though, within the last couple of years.