Basically, bot networks could farm ~3mil gold per month per fully slotted bnet account (8 wow licenses per bnet account) and you’d only need to activate game time on one of those accounts every once in a while. Like you cold farm to gold cap while inactive, then once you hit the gold cap, you’d add game time to one of the licenses, move the gold around or do whatever you want with it, then go back into farm mode.
This change breaks that behaviour and rightfully so. It’s pretty easy to make 1000g in two hours and it’s also a lot easier to hide botting operations when you have a network of bots stochastically farming seemingly innocuous things.