This is a late reply but my interpretation of the events is that the payment processors drove this decision and I think that would be for one or two reasons. 1

This is a late reply but my interpretation of the events is that the payment processors drove this decision and I think that would be for one or two reasons. 1) There is a high chargeback and dispute rate on porn. I don't know why. 2) OnlyFans has underage performers who get on there using fake IDs and there is not a very good way to stop that.