Parasocial relationships are a different topic than pornography.

Are you saying that the intersection is uniquely bad? In either case limits to content made in an effort to minimize parasocial relationships cut across very different lines than if the goal is minimizing access to porn.

I have a dumb question, but how do ewhores capitalize on this? Do they have teens running captcha farms or something?

Scrolling through attractive women (generally the thirst-traps are women) doesn't imply forming a parasocial relationship. I agree that parasocial relationships are bad, but this is independent of them being thirst-traps. Internet thirst-traps are just the modern equivalent of sneaking a look at a playboy mag or a lingerie catalogue. Nothing inherently damaging about it. The scale of modern social media can make otherwise innocuous stimuli damaging, but this is also independent of it being content of sexy women.