Moral issue aside, thanks to the unwisely expanded reach of the law via FOSTA (at least in the United States), a person who merely hosts such data might be liable:

https://www.esquire.com/lifestyle/sex/a19573460/craigslist-s...

Because of the hypothetical impedance of some unknown (but likely very small) amount of trafficking, millions of people found it more difficult to find partners for their entirely consensual acts.