If you're seeing "shitty content", clickbait and paid sponsorship, it means you haven't told the YouTube algorithm what you want to see. It's just the push of a button.

There are plenty of channels that do none of these. As for "algorythm manipulations", YT recommends more of what you like or subscribed to. Not sure what you expect a content aggregator and provider to do. Just have a search bar? I've come across so many interesting channels thanks to the "algorythm manipulations".

Citation needed. Are you saying that if there were a billion YT premium subscribers, YT would still need ads for its scale? I doubt it.