You can definitely make the case that the large moderation infrastructure fielded by gigantic social media companies has been anywhere from imperfect to outright irresponsible.

The difference is, there was actual moderation. Parler, a tiny (2 orders of magnitude tinier than Twitter) appears to have had no moderation infrastructure at all.

Even the data in your first reference seems to suggest that Twitter alone has probably moderated more accounts than Parler has actually had.