Easy as all getout.

1. Don't have "autoplay". Make the user choose. Autoplay is not good for society. "Tip your head back, turn your brain off, and let the algorithm feed you what will keep you here."

2. Give the advertisers more fine grained controls on what types of videos their ads show on. If a stink goes up because Dove doesn't want to be on a PewDiePie video, then that isn't Google's fault. It's Dove's. Let the advertiser add PDP to the blacklist, or make a more exclusive whitelist.

It's like Twitter. "Oh, oh no... how do we stop people seeing all this awful content?"

A) Stop deciding for the user (and therefore the entire website) what is awful

B) Give the user better blocking controls.

However, this won't happen, because Google and Twitter like being able to shape what the "algorithm" shows you, and keeping that control in their hands. This is why the chronological timeline isn't coming back.

Totally cool that it's easy for you! Except that youtube doesn't want to do 1, and for 2, you have to classify the videos to let the advertisers choose, which is exactly the same problem that youtube already has.

Have advertisers select on what kind of content they want to appear instead of baring all ads for some creators? I'm sure some advertisers don't mind being associated with mature audience.