The problem is that it varies so much state-by-state and country-by-country that you can't easily put one description on it. In some states, the way the law is worded, it would be a crime to disseminate leaked OnlyFans content. This is part of the reason these laws have been so controversial.
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eltaco commented
Mostly on this site we try to keep it to stuff models have consensually posed for. Stuff that's been posted to social media or paysites voluntarily. It's one thing to leak stuff that's available for purchase and something completely different to share images that were never meant to be public.