of course he could have done something about it. at that point in time he was in a pretty strong position.
>he has all the money and fame while she is unemployed and her internet 'career' is dead and abandoned
>not married so he is free to end it whenever he wants
>his reputation was still intact
>a "i broke up with my gf because she wanted to do onlyfans" situation would have increased his credibility and respect, while anisas would have been further damaged
it wouldn't even have to end in breakup. if he had put his foot down "if you do onlyfans then we are done" style, i am 99% sure she would have given in, and they would both have been much much better off in the long run.