They need login to effectively ban people. Using email login doesn't archive that (and is more work). Using providers like Facebook, Google, GitHub is good en

They need login to effectively ban people. Using email login doesn't archive that (and is more work). Using providers like Facebook, Google, GitHub is good enough, through e.g. in case of GitHub definitely not perfect. But good enough is good enough. I just which there would be more anonymity protecting *independent* auth providers you could widely use (which still could allow you to properly ban someone).