Since usernames are only unique to the instance it’s created on, what’s to stop someone from creating a copycat username in order to impersonate another user?
Since usernames are only unique to the instance it’s created on, what’s to stop someone from creating a copycat username in order to impersonate another user?
It’s always been so. John@aol.com, john@outlook.com, john@foobar.com, … What’s the problem?