Even if you accept this at face value (I don’t) note the problem: on Bluesky and Mastodon, you have to look for racy content and then follow it on purpose. It must be a deliberate, intentional choice. For the average user, my experience has been that Bluesky and Mastodon are, if anything, too tame and boring.
Whereas Twitter/X is pushing for whatever brings engagement, damn the consequences.
I haven't seen this.
Maybe you only run into that sort of thing if you go looking for that sort of thing?