Controversial assertion of day:
If we are going to accept audience viewership as a factor in tourney policy decisions, the very first thing that we have do is require players to use a name tag that is their name.
No inside jokes, no funny symbols, no random in-group signalling.
Random Joe who is curious about competitive smash needs to be able to tune into a stream and instantly follow along, even if he has never heard of the players. Even if he has never heard of the characters. (Who the hell is Korren?) And even if there are 3 Clouds on-screen.
Invisibility isn't a factor; this isn't Melee. Character limit isn't a problem either; this isn't Melee and abbreviation is a kindergarden-level problem.
There is no professional sport, amateur sport, Olympic sport, FPS, or MOBA I can think of where this isn't assumed as super obvious.