Advantages and disadvantages of using email as username?

Using an email address as a username has the advantage of being easily recognizable and memorable, making it convenient for users to log in. It also helps in account recovery processes, as users often have access to their email accounts. However, the main disadvantage is that it can compromise privacy; if a username is publicly visible, it may expose the user's email address to unwanted attention or spam. Additionally, if the email is hacked, it can jeopardize multiple accounts linked to that address.