I'm assuming it took years for Molyneux to progress from being a quirky libertarian channel to open hate. There was no single video posted that was like "I've decided I hate women", which would at least give the audience a wake up call so they can decide if they really want to be on this train.
At a more innocuous level, you can see a similar progression in a lot of YouTubers if you dig back through their older videos. Many people start out pretty normal and low-key in their videos. But over time, they become more emotive, expressive, and over the top, until eventually you get to "HEY YOUTUBERS IT'S YA BOY HERE SMASH THAT LIKE BUTTON YEAH LET'S GET IT STARTED..."
I don't think any of them chose to do that, it's just that the feedback loop is hard to fight.
This is an interesting thing I don't hear talked about much. People often criticize social media because it recommends increasingly extreme content to consumers because doing so drives up engagement.
But what I hear less often is how the reward systems of social media radicalize producers.
If you make your living off YouTube and see that you nuanced, reasoned video essay got 50 views, while you're angry rant got 50,000... you'll start feeling the pressure to make more of the latter. And your natural desire to rationalize your own cognitive dissonance will lead you to believe the things you find yourself spewing.
This is why it's so important to get incentive structures right. Because incentives do what they do whether you want them to or not.