Lean on his sponsors then forsee. Stoppit.
Start with one company who advertises in his channel and piblicly ask them if they support his statements amd track record
While I agree this should be done, we're in a new era now. He's beyond sponsors and partnerships. He could live off fan donations and events for the foreseeable future. He has about 53 million subscribers! Even 1 million is enough to live comfortably.
The last episode of everyday struggle kinda touched on this (as it relates to rap). The time of gatekeepers and people stopping someone from doing what they want is pretty much over. If this was the case they would've stopped someone like Tariq Nasheed a long time ago.