Fair enough, but... if Cloudflare's challenge bugs out who is going to fix it? Aren't they responsible for their own critical tools?

Because in the end, the result is connection denial. I don't want to connect to Cloudflare, I want to connect to the website.

I read that part. They still do not indicate what may happen, or what is their responsibility -if any- for visitors with non-major browsers.

Not claiming this is "on purpose" or a conspiracy, but if these legitimate protests keep getting ignored then yes, it becomes discrimination. If they can't be bothered, they should clearly state that their tool is only compatible with X browsers. Who is to blame for "an incorrectly received challenge"? The website? The user who chooses a secure, but "wrong" browser not on their whitelist?

Cloudflare is there for security, not "major browser approval pass". They have the resources to increase response times, provide better support and deal with these incompatibility issues. But do they want to? Until now, they did.