I dont understand what the problem is you guys have with onlyfans. Yes, i wouldnt encourage my daughter to do it before she became 18, but that's it. Other than that she is making money out of thirsty guys who dont even touch her, which is the key difference between that and prostitution. Good on her i say.
Hell, if she makes some money from it and she likes you, she might buy you two vacations or open air rave tickets or whatever and treat you like a pimp. I wouldnt care about the gifts themselves so much as i think the role dynamic of that would be gratifying for both of you. Attack formation the pimp daddy.... id be fine with that.