The rise and fall of AI Dungeon had something to do with this. I don’t know the full details but I remember a lot of gnashing-of-teeth because they at some point enabled content filters that had a lot of unintended collateral damage.
I haven’t messed with it since the thread I linked, but ChatGPT is the newest GPT model available. I’m sure it can do everything AI Dungeon can do and more, given the right parameters (and lack of filters).