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, private institutions, and corporations.
In this case as far as I can tell the server provider (not CF) was repulsed by the site content. I support that choice and the company ability to make it. Still it is censorship.
There is bad censorship and good censorship.