So there's this YouTuber with the username of literally nothing. However, when I try to set my username to " " (just a space), Google doesn't like that. When I just don't put a username, Google doesn't like it either. If it's not possible, then how does that person do it?
Note: when I inspected their username (using ctrl + shift + c), I found that it said ‌. I have no idea what that means though.