In certain parts of the Internet, OnlyFans has been a huge deal for a long time, and most definitely not because of what you'd call "celebrities" anywhere outside those parts.
It's also the primary source of income for a decent number of people.
I've never been on Twitch and am only vaguely aware that anything like a celebrity exists in the video-gaming world. Couldn't name one to save my life. (And yes I know Twitch isn't just about games.)
Edit: I have nothing against Twitch, just pointing out that it's easy to think something isn't well-known when it actually is, just not to people like you (or me).
True, but I just don't think the intersection set of those who know OnlyFans and those who know Bella Thorne is very large. We can't say the site is not benefiting from celebrities.