As a reminder, one of the definitions of censorship is:
the suppression or prohibition of any parts of books, films, news, etc. that are considered obscene, politically unacceptable, or a threat to security.
The word "censorship" is not limited to governments although, until social media became pervasive, the term was most commonly applied to governments.
"Misusing terms of use" often is a reason for censorship. This does not mean that censorship is bad when it happens, although in an open and free society, censorship generally has a negative connotation.
So, yes, being barred from an app for misusing it by standards agreed to by the user is censorship. This does not mean each instance of censorship is wrong, but it
is censorship.
Please, let's not redefine words.