Seriously though, how did Spanish Inquisition levels of prudeness become the norm on the interwebs, of all things?
Let's say you are a marketing director for (small video game company) and are using social media (Twitter, Reddit, etc. etc.) to market, network and hype your games.
Suddenly, porn appears. Possibly your characters in the game get rule34'd. Do you engage?
Maybe if you're developing a spreadsheet app or some such, then sure.
No one is going to sacrifice their 30+ year career for a bit of free advertising to a video game that you're only going to put 1 or 2 years more into.
I think "mainstream" porn is accepted for the most part. But you don't have to go very far before people ask "How old is that character by the way?" and then everything goes to shit.
Incidentally, that is also the case on Bluesky and one reason I would not dare to invite anybody on there until they address it.