Clip of his response: https://www.twitch.tv/piratesoftware/clip/AssiduousTiredBoarRitzMitz-j0W1S8wiY9wGCtK7
Video summary (timestamped at where he just trashtalks the movement for a solid minute) https://youtu.be/R-RaQZPzhqU?t=494
I don't know if there's any real good TLDR for this situation, here's the best I could find: https://www.sportskeeda.com/us/streamers/pirate-software-stop-killing-games-controversy-timeline-events
WoW controversy part https://deltiasgaming.com/pirate-software-world-of-warcraft-drama-explained/
There's a couple of other stuff like abuse allegations against him and other minor controversies like cheating in puzzle games. You can look those up if you want.
Also, for context, I do not condone any of the harm sent his way. I think what he's done is pretty scummy, but he and his team doesn't deserve being sent death threats and swatted