The problem is that employers are allowed to exploit workers like that. The wages should be reflecting the value workers create.
Only fans is also the alt path if you believe employers are not paying you your real value, now you can skip them and sell directly to the public. You might make more money or you might have nothing.
Arguably the "value" even the highest performing onlyfans people create is neglible.
When you post a message on Craigslist, do you also expect to be payed?