> I am personally wondering if Yourube themselves are going to start implementing some thing like this sooner or later; after all, you are paying for an ad free experience on YouTube premium, just to watch all of those new videos become filled with in-video advertisements.

Unlikely. It requires monitoring content and ensuring they people add (correct) timestamps for sponsored content. This would need to be verified by YouTube moderators and in general requires a lot more resources than you think. Crowdsourcing like SponsorBlock is feasible but it's unlikely that YouTube will integrate SponsorBlock into the site.

Holy shit. Kurzgesagt of all things, indeed. It's the one channel where I could actually stand their sponsor section. Most other channels I know do much worse. But I guess the video referenced was kind of low, surprisingly low.