Do you think women are all stupid to not simply get rich with feet pics and Onlyfans?

No. I think most women feel personally uncomfortable with having an onlyfans, despite the money in it.

My point is still true though, most women could make money at it if they wanted to.

And not all men could do it, not even most men. The market for average or below looking men is a lot smaller than it is for women. There's just fewer gay men than straight men, for one thing. To make enough money for it to be worth the time investment (before even considering whether you're comfortable with it) the bar is higher for men than women.

I do suspect more men could make money at it than they realize. But still, not on the same scale as women.