I’m the developer or SponsorBlock, an add-on for skipping integrated sponsorships, intros, outros and other unwanted sections of YouTube videos. It is a crowdsourced add-on, and relies on submissions on each individual YouTube video. Because of this, it fetches data from the server asking what submissions exist for a video, and uses that to skip parts of it. But privacy is integral, and we take many steps to make that the case. The add-on does not send what video you are watching to the server,...
Good to know that this is going to happen.