Same is true in capitalism, and I will die on that hill too.
If you work in a company town and you’re forced into manual labour then I see that as quite similar honestly.
That you’re not free to sell your body as a sex worker but are free to sell your body as a miner or oil rigger is a weird double standard in my opinion.
But yes, it gets muddy when you have to contend with the idea of your free will not being your own, but I don’t get the impression that girls on onlyfans are forced, that they are unsafe or that they are being put in tenuous situations (like people trafficking them and keeping their passports).