This is an attempt to seal off one of the main pathways out of interaction with its monopoly. “This will make you safer” is a common refrain of those who seek to maintain control over everything you do.
So if I go register a name "neolefty" that nobody has ever heard of, TrickURI isn't going to object unless there's a fantastic service out there already called "ne0lefty". Which sounds legitimate to me. Kind of trademark-law-y, but consensus is how language works.