This got me thinking of a tangential business idea: a user-hostile site blocker. You take a quick quiz of stuff you personally consider unacceptable from a sit

This got me thinking of a tangential business idea: a user-hostile site blocker. You take a quick quiz of stuff you personally consider unacceptable from a site (such as blocking disposable emails), and then it comes up with an autoupdated blocklist. Does this exist?