I know this issue all too well. It's worse due to the fact that @gmail.com and the legacy @googlemail.com both get sent to the same mailbox, as well as ignoring any punctuation in the address. So firstname.lastname, and firstnamelastname also just get sent to the same mailbox.
There's some guy in Liverpool keeps using my address for Uber Eats, and Doctors appointments. Someone malicious might cancel said appointments, or take advantage of the fact that password resets for Uber send a text message to their registered phone number... at early hours of the morning. Repeatedly. :innocentsmiley: