It is 20% and they slap a fee on when you go to cash out (plus it’s in dollars so what’s the exchange rate?)
Also it’s 29 likes not 29 fans so she won’t have made over £200 her story showed 5 fans so closer to £50 (at the time) but I wouldn’t be paying £10 for someone who isn’t a known sex worker and has only 3 posts
seems like a rip off, when big porn stars charge less than that
edited to add: she had 5 fans prior to sharing on social media there is a big chance these are her friends as you can offer free subscriptions to people so she may have made nothing.