Because we focus on abstract problem statements, coded appeals to authority (as if ex-Reddit CEO is that special; there are a few), rather than concrete engineering?

User demand to control what they see is there. It’s why TV was successful; don’t like what’s on History? Check out Animal Planet.

Tech CEOs need their genius validated and refuse to concede anyone else knows what’s best for themselves. What everyone else sees is a problem for a smurt CEO to micromanage to death, of course.

An modern smartphone CPU is more than sufficient to perform real time filtering of a controlled stream. Doesn’t even need a backend content filter, really. Being ex-CEO of Reddit may not be sufficient experience to solve what is, in the end, an engineering problem.