"Paid sub?" What?

No, uBlock Origin and SponsorBlock are both browser extensions (and both free in terms of cost and freedom). uBlock blocks the ads that YouTube inserts into the stream as separate files. SponsorBlock blocks the ads that the Youtubers themselves embed into the video before uploading. Even if the Youtuber is reading out a sponsor message himself without so much as a jump cut, SponsorBlock can block it as long as somebody else who saw the video before you marked the start and end timestamps. (It also lets users categorize what kind of segment it is, so it can skip self-promotion, intros, "like, comment, subscribe", etc.)