Oh yes. Back in the old days of MC, the only way you could change your user name is if you put in for a request to Phil, which he would then either allow or disallow, or you had to create an entirely new account, which Phil and Ed frowned on.
Once they allowed for username changes (albeit with a limit of three changes), so many members he began abusing that feature, it got incredibly confusing!
This is also a major problem with Discord as well, but at the same time, it does have an advantage, because it allows you to change your name on different servers so that if one fandom recognizes you by one name, you can use that name on that particular server, without necessarily having to use it for other servers.