I don't think YouTube should get further into the dangerous spiral of chaperoning the content of videos. If there are too many sponsored segments in a video, take it up with the creator or stop watching that channel.
I'd love an option to be able to filter out all videos from my feed that have sponsored segments. For me, I find the best content is the underground stuff made by folks who don't have a clear profit motive.
yeah I think the free market can figure ad load out. creators who go overboard on sponsored segments will get less views, less engagement. there's a natural equilibrium.
In many countries ad sections have to be clearly marked for another reason the "free market" hasn't solved: disguised advertising. I wish the US got with the times.