> I'd say places like Onlyfans end up being net negatives for both the models as well as the fans.

Someone could argue the opposite: It's a net positive for a model who is able to separate herself from the work and use it as a means to earn money, and it could be a sufficient honeypot for men who would have otherwise become predators.

Personally, I would call it an unhealthy relationship. I think it's vastly in favor of the models because they're making money at the expense of extremely desperate older (i.e. wealthy) men. It's sort of a creepy-man trap, shepherding these men towards the models (remote/safe) and away from potential victims.