I've had extensively dealing with Cloudflare. They have a complex whitelisting system that is difficult to get on, and they also have an 'AI' system that determines if you should be kicked off that whitelist for whatever reason.
Furthermore, they give Google preferred treatment in their UIs and backend algos because it is the incumbent and nobody cares about other smaller search engines. So there's a lot of detail to how they work in this domain.
It's 100% Cloudflare's fault, and it's up to them to give everyone a fair shot. They just don't care. Also, you are overlooking the fact that Google is a major investor (and so is Bing and Baidu). So really this exacerbates the issue. Should Google be allowed (either directly or indirectly) to block competing crawlers from dowloading web pages?