I'm guessing that most exJW YouTubers aren't making a living from it. While Evans may make it seem that it's a full-time job requiring a corporate entity and multiple employees, most people make YouTube videos in their spare time and earn money working a normal job or career. Is there any other exJW whose primary/sole source of income is YT videos?
In any case, you can make videos about the WTS without being a "professional activist." You don't even have to be an activist at all. Chris Stuckman makes videos about movies and movie-making, which is his passion. He also made a video about his past as a JW and how it impacted his life. A good video, IMO. He's not an activist. I bet there are others.
Remember that Evans explained that, without enough money to earn a living, he would not make exJW content. I would even say that his message was that he wouldn't make content if he wasn't earning a comfortable living from it. His primary concern is making money from exJW/antiWTS videos. He is not shy about making this clear. If his earnings keep dropping, so will his output.
Want him to save the world? Send him money. Lots of it. And don't you dare tell him how he should spend it!