She had a pretty good point. Any given popular music video is loaded with borderline porn. Why were her fully clothed yoga videos (that weren't even questionably sexual) not allowed but the former were?
I don’t know what caused her videos to be demonetised, but she’s not wrong - it does seem pretty much arbitrary with no proper channel for disputing it.
We've heard loads of stories of people getting AdSense accounts shut unfairly and without recourse, for example. If that was your entire income, you already felt hard done by, and were so inclined, I could see how you might go off the rails.
Most people would leave such a “job” or try to game the algorithm, but killing the boss does also look like an obvious (if wrong and probably unproductive) option!