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The most effective regulation here is from payment handlers.
Not sure what eventually became of this, but MasterCard shitcanned PornHub a few years ago. See https://www.bbc.com/news/world-52543508
I also see a statement from 2022 reinforcing that decision. https://www.mastercard.com/news/press/2022/august/mastercard-statement-reinforcing-adult-content-standards/
I guess even that’s not very effective since PornHub is obviously still in business. I wonder what their numbers looked like before and after.