I don't really know just how bad this is for burst bottom line is he still needs to have the storage space available. If he is doing it without permission and illegally then he will be arrested not like it is not eventually traceable. If he legit has 15k some pc under his control and he just plotted all of them. It sucks but i don't see what can be done about it. Can't really limit the number of ips reporting per wallet. You also can't just ban him for running 15k pc to add up to a multi petabyte array. Problem i am seeing coming from this is anyone with a sizeable network under their control might do something like this. No there is no fix for this from inside burst it must be fixed outside and that fix will be law enforcement and arresting him. If he is doing this legit then there is no fix.
And the miner and plotter are already detected by many virus scanners.