alt Hacker News"you know it when you see it" is a trap and ripe for abuse in its own right. Your description however is pretty spot on for this moment in internet evolution.
Interesting to me is that I pay for youtube premium so I don't see any ads. They even have the jump ahead feature where you can skip in video project promotions. It's the most ad free experience I have on the internet. The comment sections are about the lowest of the low knuckle draggers and outright dimwits.
I'm also a bit out of touch because I quit all social media. Youtube shorts is about the closest I get and that's a mind sink for sure. [Edit: and hacker news which I consider social media without the ads]
I mostly use YouTube without ads, and with sponsorblock, so a similar experience.
I think YouTube shorts is exactly the experience we're talking about. And the youth watch it by scrolling up, not by selecting shorts that look interesting.
I resisted shorts for a long time, but I watch them now as well. Prefer them, even.
The fact we're not seeing ads, and that the comments are atrocious content, is irrelevant--our attention spans are at stake, not our wallets.