I like the idea.
there is 100s places where player name can be shown, multiply that by ~20 base resolutions the game support, and checking them one by one would be too much effort.
"one of the Dataminer accidentally comes across it" what?
some sort of clans/guilds/or whatever it would be called is planned feature and making the names bit shorter to allow that is one of considered options, but we just can not simply limit existing names, because it would break things like mails for example.