You call it that I call it Fraudulent Misrepresentation, which could get him in far more trouble than just finding somewhere for his work. When you sign up to website it may feel like just a click, skim the T&C and hey ho free money! But you're actually signing a legally valid contract, and if you misrepresent what you sell or offer.....it's a big no no if caught. The likelihood is small, they'd probably just ban his account and take the money he's still got sitting around, Patreon's done that to people for example and I bet subscribestar would too, but there is always the possibility they could take him to court for damage to reputation or other such. I get playing the game and bending the rules, but you have to play it smart.
Plus...subscribestar has two sites: one for none adult and one for adult, so the idea wouldn't work anyway.
I've seen it on Fiver.com, some guy doesn't read the terms and starts selling homework and university essay services, get's banned and then complains in the forum about why they banned him and kept all his rupees. I'd rather not have that happen to OP.