They are utility though. Have you thought about that people support neutrality/common carrier style behavior with 8chan existing being the acceptable price to pay and not 8 chan itself?
They are not a utility. At all. They are not comparable to your water or your electricity in any way.
They are comparable to a self-storage place you might keep your boat. Or an office you might rent to house your business. But they are not anything like a utility.
Generally, utilities have a regional pseudo-monopoly. It’s unlikely more than one entity runs electric or phone lines to your house, say. CDNs aren’t really utilities, and most of them have long been pretty picky (most won’t deal in porn, say).
They host and indirectly disseminate media, just like a news network. Do you expect Fox or CNN to host views they don't find acceptable? If we're going to accept that biased media is legal (news networks) then biased media is legal (Cloudflare), although you'd have a harder time making a case of bias against Cloudflare in comparison to the former.
At some point, the price is unacceptable in light of the benefits conferred.
And Cloudflare isn't a utility. I agree with Cloudflare's decision. I hope whichever host 8chan runs to will do the same. Free speech is not a suicide pact.