Comment by robinanil

This is the clearest articulation of the problem I've seen in this thread. The chronological social graph feed era was fine. The handoff to engagement-optimizing algorithms is where things broke.

I'd add one additional layer: it's not just that the algorithm picks what you see, it's that the entire UX is built around keeping you in the loop. On YouTube Kids, even with autoplay off, the end-of-episode screen shows a grid of recommended videos. My toddler doesn't care about "the algorithm" in any abstract sense. He just sees more fire truck videos and wants the next one. The transition out of the app is designed to fail.

Your point about smartphones not being the problem is key. I was at Google during the era you're describing, when the phone was a net positive. The hardware didn't change. The business model did.