I've been with fatties for free in my younger days.
Then, interestingly, the last woman I banged for free (back in 2021) was beautiful and tiny (ok, maybe she could have lost 5 pounds, but that's not exactly a fattie). Yet there are obese escorts who can get men to pay for sex. The sex marketplace has no rhyme or reason.
One thing about the obese escort I mentioned, she's at least good-looking facially. In fact, when I was heading to my place with the obese escort, a male neighbor made it obvious he was into her. Then the escort texted me after the session to say she crossed paths with the same neighbor on the way out of my building...he couldn't take his eyes off her.