People do not believe that their email and identity is in any way linked I think that you might have to explain that a bit. I think that others try to argue t

People do not believe that their email and identity is in any way linked I think that you might have to explain that a bit. I think that others try to argue that people use email at least as temporary identity, in the sense that at time t, they identify themselves with at least one of their email addresses. In practice this is enough for many web sites to use the email address as login. Perhaps you are talking about some longer sort of permanence, or uniqueness?