We don't have a lot of experience yet with DDOS protection so there might be downtime as we learn that. As you can see in the issue we're working to implement protection before we need it but it might not be ready in time nor can it protect against everything.
Who are you to decide that my use of Tor is not important enough?
CF is simply giving site owners levers to use if they so choose. While I am a strong supporter of Tor, privacy, and anonymity, CF has done nothing wrong here by allowing site operators to selectively choose who they wish to serve to.
I'd imagine if there was a major ISP network out there that was doing NATing or similar for their customers so everyone came from a small set of IP addresses they'd get the same treatment. More users on the same IP means more abuse from that IP. If anything Cloudflare isn't discriminating. To handle Tor users better you'd have to discriminate (technical definition, not the negative form) to handle Tor users better
This would be an absolute showstopper bug which would prevent some of us from using GitLab Pages if it became a requirement. Definitely do not want.