I have asked this a few times and never gotten an answer beyond "One day they could turn evil." What is the reason Cloudflare is an extortionist firm? I am way more concerned about Amazon than Cloudflare.
Cloudflare describes that policy as a commitment to content neutrality rather than extortion, and I think that's more or less sincere (since they've protected many other unpopular sites that didn't give them such a benefit, with a few high-profile exceptions). It does work out very conveniently for them, though.
But we know that's not true. Point out problems with a very controversial blogger and they'll cancel your service.
Because they are a publicly traded company