Because privacy matters. You really trust that Pornhub won't be storing the info of people who access it, including specific content tied to users, and that the

Because privacy matters. You really trust that Pornhub won't be storing the info of people who access it, including specific content tied to users, and that they couldn't have a security breach? If you want to protect children, you could perhaps have a trusted third party token broker which would neither reveal to the sites who owns the token, nor the site to the broker what content is accessed.