If the answer is "they just don't get access anymore" or "a panel of their peers attests to them", your fantasy authentication system also needs a fantasy speci

If the answer is "they just don't get access anymore" or "a panel of their peers attests to them", your fantasy authentication system also needs a fantasy species of sentient beings to serve as users, because it won't work for humans. It won't work for 99.99% of services, but it can work if your service is huge. WeChat uses a mechanism like this, and it works well.