I agree that it is a little sensational, as it happens mostly when you like only limited groups of things. It gets harder for algorithms to polarize if you "mess up" with the algorithm and like many different kind of things.
To clarify, I don't mean with "extreme" necessarily a bad things, just content which gives you "extreme" emotions.
This seems a little sensational. Many people (myself and most of my friends included) don't see _any_ "extreme" content or polarization. A quick scroll through my feed is largely nothing but magnet fishing, frog tracking, cats, DIY projects, and geologists talking about rocks. It's enjoyable and arguably a dopamine dose on-demand, but not necessarily a road down more "extreme content and polarization".