[IMTDb]

You are comparing apple to oranges. Social media posts are static, don’t watch you etc. But the distribution platform does all these things.

In books it’s exactly the same thing: do not believe for one second that the publishing industry does not watch engagement metrics (aka: sales) and does not adapt to the taste of the market. It’s also tuned to maximize outrage; see how popular unauthorized biographies of polarizing figures have become - who is next on Walter Isaacson list ? I am betting Trump must be somewhere there and it’s gonna be a banger.