Beyond the upselling under duress, I've also seen complaints that Cloudflare protects the client-facing websites of DDoS-as-service operators. This enables them

Beyond the upselling under duress, I've also seen complaints that Cloudflare protects the client-facing websites of DDoS-as-service operators. This enables them to sell their service, which then creates demand for Cloudflare's service from their targets. 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.