As someone who spent over a decade in the adult industry BackPage was extremely responsible. They had a staff of 70 people dedicated to reporting suspicious ads to police. They were the #1 source of trafficking tips.
Another socially responsible escort ad site was owned by a woman (former sex worker) and was forced to sell to a very shady eastern european gentlemen who is referred to as the trafficking king of europe. She sold because she didn’t want to go to jail.