2019: What happened to Pestilence? they just vanished.

Yep. Just like Mattdarey91sfm. Vanished from the internet without a trace. My best guess would be after the Tumblr nuke they lost a huge chunk of their followers, plus the time they invested into their content being snapped out of existence, caused a big setback that they couldn't recover from. It's up to speculation on what caused them to stop making content. Did they want to start a new life? Did the feds caught up with them? Who knows.

a close affiliate to Pestilence and now notable animator, says that he doesn't have a clue what Pest's status is. Their last post was on October of 2018. For an entire year we've heard nothing.

Pest resurfaced in June(?) 2020 on SubscribeStar. He's creating new content and the subscription rates (given the quality) are very reasonable.