Had to look this up, but to put it into context, Finster is basically the top cross-dressing/trap/femboy on OF. He has more followers than Natalie Mars who is a famous trans porn star that got her start right here on 4chan/s /b/, but Finster also charges a lot more per subscriber.
Basically, no other born male is earning anywhere near as much.
https://www.straight.com/guides/personals/femboy-onlyfans/OF says creators can keep 80% of the subscription cost. Which is huge. Cam sites used to take 40-85% so this was a good business decision that helped OF snipe all the creators from every other platform and create a huge user base overnight.