"Censorship is the suppression of speech, public communication, or other information, on the basis that such material is considered objectionable, harmful, sensitive, or "inconvenient". Censorship can be conducted by a government,[5] private institutions, and corporations."
This is the wikipedia definition of censorship, so that makes your definition wrong.
- did censoring 8chan significantly limit any sort of harmful behavior?
- is censoring 8chan "right"?
- does this merely hide the problem, preventing an open discussion?
- should CloudFlare, an entity with massive control of Internet infrastructure, really be acting as a moral arbiter? Or do we expect some kind of neutrality from them? Do our expectations matter?
The line isn't as clear when you generalize the action.
No free speech rights were trampled on, and no censorship took place.