It doesn't really matter that much if you want to use the word "banned" in preference to "censored"; the facts of the matter is that the entire right wing's viewpoint is under threat on these channels to the point where people have been decamping and moving on to other platforms in large numbers. There have been quite a few notable social media plays (thinking Gab, Parler & Truth Social) that may as well have started in response to the 2016 election.

So we don't have to use the word censorship but there is a lot of voting with feet going on that suggests some sort of speech suppression. The persistent banning of private opinions by American big tech is probably the major cause of that.