Usernames only? There’s someone living in the US not being able to write their own gmail address correctly. Thus, I sometimes get things like confirmations of h

Usernames only? There’s someone living in the US not being able to write their own gmail address correctly. Thus, I sometimes get things like confirmations of hotel bookings they did. What if you get flagged because someone else used your username to post stupid things? Will you even be informed of the offending posts and have opportunity to defend yourself? This requirement doesn’t make any sense.