She recently got interviewed in Ezra Klein's show to discuss the same:
https://art19.com/shows/the-ezra-klein-show/episodes/109611f...
To paraphrase one of the better soundbites in the show: YouTube is like that friend in high school who always outdoes you no matter what you do. You're vegetarian, she's vegan; you're moderate left or right, she's at the more extreme end of the political spectrum; etc.