They're probably not promoting the pornographic content because they don't want that to be their brand. The way to end up on the porn is to be following someone

They're probably not promoting the pornographic content because they don't want that to be their brand. The way to end up on the porn is to be following someone on another platform who is either already posting dirty content on that platform and now wants to monetize it or by following someone who is popular for some other reason but then realizes they can get a lot more money out of their fanbase by selling nudes.