I think that they tried phone numbers but data privacy laws also came around and created holes that made it optional as well if I remember right. as you said it doesn't stop the ones who really want to continue doing what they are doing but it does deters a population that doesn't want the hassle. We have the tech to do this we just need the social media platforms to start accepting responsibility and living in a world of no repercussions.  As for the AI problem, the bigger issue isn't the