I'm in favor of extra-legal filtering, according to a company's morals,
as long as market alternatives exists.
If speech crosses the line, law enforcement should pursue and prosecute.
Short of that (e.g. the "we were just joking" crowd), the best possible aggregate outcome seems like it would be companies making independent moral judgements and acting on them.
If Cloudflare doesn't want to be associated with 8chan, they refuse them as a customer.
Other customers are then free to judge Cloudflare for that action and use / not use them as they decide.
This seems far preferable to more draconian, government-enforced options.
Companies are inherently political, and a diversity of options is the healthiest ecosystem.
Not, this requires that we have functioning alternatives. For something like 8chan, Cloudflare's services are probably avoidable, but there's a market penetration at with "must serve" should be considered.
E.g. if Facebook banned a political party