> I think no video is better than one that starts with ad. At least for long term mental health

That's vague. I think most people would disagree, and the commenter is right that people put up with ads for a certain degree of quality. We used to have 4 minute ad breaks on TV. The only reason people moved to streaming is because the quality was the same.

I can't imagine ads are doing much more damage to our mental health than the content we consume in the first place. Likely less.