Just to make this clear: Any kind of coercion beyond the non-aggression principle is illegitimate. This means that any state ban of any online content is illegitimate. Only private platforms like plebbit or 4chan can exercise consorship power over their own platforms if they like to.

Further, payment providers like visa and mastercard can choose to deny service to any porn platform if they so choose, which is not a problem in a free market since you then could just change payment providers. But we dont really have a free market due to coercive state interventionism. So its fucked from the get go. Read Hans Hermann Hoppe