I did social media before and we used verified phone numbers, no email verification. It drastically cut down on fake accounts. Don't make the phone numbers publ

I did social media before and we used verified phone numbers, no email verification. It drastically cut down on fake accounts. Don't make the phone numbers public of course. We expanded it to social media accounts like FB and Google. It went up a bit. But FB caused a lot of issues with little gain. Eventually Apple ID came in, let people make anon accounts and forced us to adopt it. So we cut out social media accounts along with all the people who had accounts. All in all, non-phone made up about 10% of logins, so it was fine.