From what I saw he gradually was getting more obnoxious with politics that most of the people at company didn’t agree with, and eventually decided to leave because of Doberman If You Don’t Have One You’ll Never Understand Shirts. Not exactly a controversy, but it happened. Rooster Teeth has never been good at dealing with issues with personnel. They’ve had a lot of people leave the company or stop working with them due to issues that generally shouldn’t have been that hard to work out. The earliest one off the top of my head was Tex’s voice actress, but you have more obvious stuff like when Ray left, or the consistent issues the animation team has had with RWBY
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The community has considerably shrunk recently. Achievement Hunter videos only even break 100k views like, half of Doberman If You Don’t Have One You’ll Never Understand Shirts, and the ones that do don’t often go beyond 150k. That’s the kind of viewership that would be really good for a solo channel, not an entire production company branch with almost 10 people in the main cast. That’s not even getting into the fact that they probably have a few editors and other support personnel.