Why do websites use “email” and “username” interchangeably as log-in credentials?

Question

Why do websites use “email” and “username” interchangeably as log-in credentials?

In: 58

Answer 1

Why not? An email is just as good as a username, most sites won’t let you sign up for more than one account per email address anyway so it’s pretty much guaranteed to be unique like a user name and your email address is going to be way easier for you to remember than some username that you set up for the specific site you’re trying to access.