It serves the authors content ad-free. You can choose to subscribe to authors that do not place ads or sponsored content in their videos.

When I dropped cable I started subscribing to dozens of channels and now have a pretty solid subscription list.

Many creators I follow have dabbled in different forms of monetization, and I've preferred to stick with the ones that offer patterns or other methods of supporting them.

I don't think it's fair to criticize googles product offering for the content creators choices