1. The vast majority of right-wing content goes uncensored.
2. A few really choice targets for censorship get categorized as "misinformation", "disinformation", or "malinformation" and are subject to widespread campaigns of suppression.
(... And there may be systematic algorithmic down-weighting of some right-wing ideas or accounts, but I'm not confident enough in the evidence here to call it a serious problem, which is why there's no #3 on that list.)
Probably the most non-partisan example I can think of would be the Christchurch shooter's manifesto, a document which approximately everyone disagrees with. For a while after the massacre, it seemed like every social media platform was aggressively trying to make sure nobody could read the thing. You could find a copy with some effort, but only by skulking around in the shadier parts of the web. You could say that they're private companies and can do what they want -- but if they hadn't censored in lockstep, it's likely that some government displeasure would come down on the uncooperative companies later.
The result of this is a censorship regime that's hard to see because it only goes after the high-value targets.