So, there are many kinds of 'shades'. There is the two account shade and there is the 'player changed his name shade'.
First off, as pointed out before, one does not need 'shade with two accounts' to tell where the enemy is, the map is quite useful. Frankly, any time a mission gets busted up, people cry 'cheater'. Its funny how it never crosses their mind that maybe, they were spotted on the map, or by a player who happened to be there, etc...
Second, I don't support cheating, almost all cheating claims are BS. That being said, the game is about combat, not cowering away trying to avoid fights and crying when a fight finds you. If this is in response to the usual reason, "My mission got busted, they must have been cheating, nonsense", well, tough it up kid, its a combat game.