The terrible thing is this probably pushes performers to more predatory platforms / aggregators.
I bet this move could somehow be traced to machinations from the big porn industry players. I think if people want to make money doing this stuff and they're legally of age in a place they do it, and if they're not hurting anyone, then you shouldn't get in their way. If it's a free choice to engage in it and they are not trafficed nor coerced nor debt trapped, it should be a way that people can access to generate income or express themselves is that if that's what they choose.
I've heard of onlyfans but I've never even seen any content on there and the screenshots I've seen have just been sort of racy but not explicit and i don't know anything about the background of this decision, but... just in general I think it's easy and useful to frame it from the point of view of freedom of expression and commerce versus a moral panic or crackdown on independent content creators who are empowering themselves with content in a market that pays premiums and they can achieve a better standard of life than by doing other things, and it's better than them working at the behest of or in contract to someone else. So from that point of view I think it's a great thing that people could do this (like uber for racy content or if you want to take it to the extreme: Uber for explicit content) and it's really sad that this platform seems to now be disallowing that I think to the great harm and detriment of all the people who could formerly freely engaged in making their money that way.