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Cloudflare drops sites from their service on a daily basis for having content they dislike. They remove sites with adult content, support for sex workers, etc. They also drop sites they deem to be posting spam. Cloudflare's censored 1.1.1.3 DNS blocks lots of LGBT content, etc.
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Cloudflare banned Switter from using their DDoS protection which is provided as part of their caching reverse proxy. Cloudflare's main service is the reverse proxy. They weren't hosting Switter, they were proxying to it, which they say doesn't count as hosting the content.
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Their proxy is inherently caching based on Cache-Control / Expires headers. It tries to cache everything it can cache and then serves it from cache until it's supposed to revalidate. At that point it does conditional fetch that only actually fetches the content if it has changed.
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