I can't speak for the person you're responding to, but I don't think an assumption of human trafficking by the site's owners is supported given that some other site's owners did human trafficking. By all accounts I've been exposed to, models on OnlyFans earn much better than models on other sites. That seems like a prima facie reason to believe it's overall a good thing, and the evidence would need to be presented to demonstrate otherwise. Starting with the assumption the owner of something you don't like is a human trafficker is not a good way to make a convincing case against OnlyFans.