It's not that the article's points are wrong. They're right and well argued.
But this is real rich coming from the #1 blocker of people on the internet. What a lack of self awareness. Yes, IP blocking can be bad, but other forms of blocking that cloudflare engages in are just as bad and not everyone has cloudflare's MITM market position to exploit.
The complaint about CF blocking is, I think, the other way around: blocking users access to sites, or making access a faf, because of the address their request comes from. It affects people behind GCNAT significantly, as well as those using commercial VPNs, because of the activity of others who appear to come from the same address*.
Unfortunately there is little you can do about such collateral damage other than wistfully wonder “what if IPv6 had been implemented widely, and properly, some time ago, so such address sharing wasn't necessary”. VPN users might still end up coming from the same address/range so be indistinguishable from bad actors using the same VPN, but that is their choice to be unidentifiable and they should be aware of the ramifications†).
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[*] It can impact those with a dynamic address similarly, but more randomly.
[†] I'm not saying not wanting to be identifiable is not a bad thing: just that you need to appreciate that being indistinguishable from the average non-identifiable Internet user makes you, erm, indistinguishable from the average non-identifiable Internet user[‡].
That's an easy one, it's all of the ones that use Cloudflare.
If your IP address is for some reason blacklisted by Cloudflare, you're screwed. With CGNAT, this means that you can have a hard time visiting many web sites if your IP is used by someone else who does nefarious things.
Almost every website that uses cloudflare is inaccessible except using near bleeding edge latest browsers. If you use a non-standard browser or have JS turned off you get blocked by cloudflare's chosen defaults. It doesn't matter what your IP is. Even my Comcast residential IP doesn't work.
But this is real rich coming from the #1 blocker of people on the internet. What a lack of self awareness. Yes, IP blocking can be bad, but other forms of blocking that cloudflare engages in are just as bad and not everyone has cloudflare's MITM market position to exploit.