Actually is, considering on the Argent Dawn forums the thread he watched on stream didn’t have any of his fans posting in it before he watched it on stream then it got flooded with tons of off-topic posts, spam, and disruption. Same thing with visiting an RP server, are they there on that server disrupting it while he’s not streaming there? Nope. Are they when he’s streaming there? Yep! So, he does have a cause an effect and the fact that he’s aware of this and does nothing, in fact makes him responsible for what happens. Especially, when he’s not shown to be reporting any of the bad behavior and exhibiting it himself: See targetted harassment, RP disruption.
furthermore, Blizzard posted about reporting bots. They told people to go out there and do it: Thank You For Your Reports