Censorship is the suppression of speech, public communication, or other information, on the basis that such material is considered objectionable, harmful, sensitive, or "inconvenient".[2][3][4] Censorship can be conducted by a government[5], private institutions, and corporations.

That's the first definition I found when I googled the word. Reddit, a private institution, considered the content harmful. Seems to fit the definition.

Deplatforming, shadow banning, deboosting, demonetization are all modern forms of censorship. It might not be exactly like the Chinese or other types of censorships we have seen in the past but it is a valid form of censorship. Definitions aren't everything, context matters. If you want to see a rising power filled with authoritarianism, look towards Google.