Much as I am loathe to excuse X for anything, I suspect that it’s due to the trend for governments putting age-related restrictions on exactly the sort of stuff that pervades X.
I’m going through the same thing setting up blewit [1] (a reaction to the traditional “sell the people’s data” social media sites) at the moment, had a phone call with the National Crime Agency, got all my Ofcom policies documented etc) - mainly because it’s a) user-to-user and b) because we will allow nsfw stuff after an age verification. That’s the law now in the UK and it has teeth - a criminal prosecution, not something a company can shield directors from.
1: https://blewit.net <- tap on ‘Open the sandbox’ for a demo