By now I reached a point where I don't believe that big tech companies will do anything to improve outcomes for user if it will have a hit on their bottom line, and I'm sure that opposite is true, they will do anything to improve their bottom line even if it hurts the user. So it's fair to say that this relationship can't work in long term.

I'm not really on the platforms mentioned except of YouTube, and it's considered to be the lesser offender here but still I can't avoid seeing how bad it got.

I remember 2007-2012 the platform was mostly for entertainment, silly cat videos pranks, a low budget documentary here and there. 2012-2015 felt like the period where YouTube became a platform for more useful things, people showing how they are fixing cars, professors uploading their recorded classes, history channels, but on the sidelines people were starting to make money off doing weird things, like unboxing stuff on camera, drop testing phones, etc.

If you were told in early 2000's that people will be getting extremely rich by unpackaging products on camera, you would have been called insane, no one would have considered wasting their free time watching things like that. It might be more difficult to convince older folks to engage but younger generation was malleable and was easy to hook, and slowly it became normal.

2015 to present days became a period where it's completely normal to make user to watch the ad disguised as content. People testing/showcasing/unboxing products or even political ideology propaganda presented as discussion in form of a podcast.

It's obvious that the quality what is offered on YouTube has gotten worse, but they can counter it with autoplay, infinite scroll, landing page filled with eye grabbing content. The only way to watch things on YouTube and not be effected by this nonsense is to use a different client (freetube, jaybird, newpipe, there are plenty more). You can define of your homepage will look like, weather you want to see shorts or not, infinite feed, suggestion etc.