Hot take, but the only real way to solve this identity problem is to take people's DNA. The only attack on that is to literally synthesize fake DNA/fake hair/fa

Hot take, but the only real way to solve this identity problem is to take people's DNA. The only attack on that is to literally synthesize fake DNA/fake hair/fake saliva. Even then you can prompt randomly for DNA the way Twitter randomly prompts for phone number verification. Or ask the user for a selfie and spot inconsistencies in the mapping from DNA to face. It's scary to let internet companies have your actual DNA (though that didn't stop 23andme customers), so there could be an layer in between (a nonprofit? machine with a hardware security module?) that does the DNA sequencing and returns a digital signature to authenticate you. The obvious downside is that it would work too well. Banning becomes much more serious of a thing when it's lifelong and potentially could affect your descendants. I hope I'm not giving anyone any ideas because this is horrible.