Why do you hate Cloudflare so passionately?
However in this case I think we can rely on them to tell us what they did. If they say they got a 7.3 Tbps UDP DDoS, chances are good they actually did.
What I say is that instead of hating on cloudflare one can look up how a DNS server works and start getting into DDOS mitigation ; but even after a couple of month anybody would still just have scratched the surface of it.
I don't think it's Cloudflare "goal" to centralize the internet, neither it is to set up captcha everywhere ; but it's definitely frustrating