I was planning to do this anyway, as the user goes through the app, get a nibble of information each time. But with only using an email, it instantly creates a

I was planning to do this anyway, as the user goes through the app, get a nibble of information each time. But with only using an email, it instantly creates an account for them. Sending a login link also gives them something to keep. And if they come back years later(after just using) it should be easy for them to re-authenticate.