From my little corner of the internet (furries), porn was often a lead generator. People came for the hot werewolf boyfriends, then stayed for all the non-porn stuff. They don't necessarily stick around if the thing that reminded them Tumblr existed goes away. They follow the draw where it goes. A lot of them moved to Reddit, Twitter, Mastodon, and Telegram chats.

It's a niche, but not a small one. Enough niches tumbled together (or out) is a lot of people.