One thing to note is that CSGO can be considered a play-to-earn type game; you play the game, get lootboxes, get lucky, sell the item for... idk, hundreds? thousands? So it's an incentive to cheat and buy new copies of the game if found out. A single item can be a month's income easily.

Mind you I don't know if that's the case on privately hosted servers as well, since those could be manipulated to give players the points needed to get the lootboxes.