As I’ve mentioned in another thread, I believe YouTube provides analytics on this (hence the “most replayed” parts for some videos), and I’m certain I’ve seen some creators mention sposors requiring that information before a deal is made. So it may really hurt some small youtubers that can’t rely on merchandise sales.
That said, I personally use sponsorblock as I don’t feel like wasting my life on nordvpn ads, but I have to admit sponsor segments are a whole lot better than regular YouTube ads.
Edit: And as I far as I know they pay much better than regular ads.