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I think undesirable here describes something like white nationalists. They have a problem getting web hosting.

CloudFlare has strategic business partnership with Baidu [1]. They are very likely to cooperate with the chinese government to implement the great chinese firewall.

Additionally, helping to block Wikipedia because China says so is much easier to excuse than blocking 4chan - they would just be complying with local regulations after all.

[1] https://www.cloudflare.com/press-releases/2015/cloudflare-an...

Because all of them don't want it?

Unlike a DDoS attack, this is not a technological problem.