Hang on... Hacker News very clearly has a complex, opaque [1] algorithm that orders stuff. Maybe it's not user-specific, and maybe that's a good dividing line, but these are the kinds of factors we're going to have to think about if we want to introduce regulation around 'algorithms'.

Infinite scrolling is a very different issue (although it's definitely a contributor to the harm, I agree).

([1] Unless I'm being unfair here; maybe the algorithm is available somewhere, I just don't see it obviously linked anywhere)