Earlier quoted context omitted.
Install SponsorBlock! With YT Premium and that, my video experience is completely ad-free.
Install an ordinary ad blocker and your video experience will be completely ad-free without needing YT Premium.
Apparently "SponsorBlock" actually solves that. Haven't of it before, but the description is promising.
>>> SponsorBlock lets you skip over sponsors, intros, outros, subscription reminders, and other annoying parts of YouTube videos. SponsorBlock is a crowdsourced browser extension that lets anyone submit the start and end times of sponsored segments and other segments of YouTube videos. Once one person submits this information, everyone else with this extension will skip right over the sponsored segment.
https://chromewebstore.google.com/detail/sponsorblock-for-yo...