Have you seen the amount of bots that are created every day? You have the advertisement bots of the nexus, the tracker bots of the realm and bazzars, and the occasional flood bots that attempt to crash a server or realm. Then you have to take into account that they are in every single server in the game including the inactive ones.
In other words? Hiring moderators or assigning DECA members to manually ban every single one of them is like trying to fight a blazing fire with a cup of water; It just keeps growing, while you waste resources trying to fight it.
It’s not an easy issue to fix that’s for sure. The solution has to be automatic, because the creation of bots employed is also automatic, but even thinking of a proper defense idea is quite challenging when you want to ensure your defense solution affects the bots only, and not the players, otherwise you’ll get some angry backlash (eg. Shadow muting due to certain phrases)