I am not intimately familiar with the workings of Only Fans, but presumably the young person registered as over 18, and, if so, it is true nothing illegal took place during the, er, performances. Of course it is sleazy and ick but unless there is evidence of the young person divulging their true age then it is just one of those grim stories.
There is so much more to this story - or perhaps there isn’t: perhaps it’s just a case of good old-fashioned blackmail.
Whatever, it does - literally - expose a sad man behaving in a dodgy way when he has everything to lose.