You don't have to force it either. It could be an option. And if it was well-designed, it could probably be made so that it was only pseudo-identification, e.g.

You don't have to force it either. It could be an option. And if it was well-designed, it could probably be made so that it was only pseudo-identification, e.g. where the site knows you're a real person, but not which one, and where the issuer knows you have an account on the site, but not which one.