That's the service's problem. VCRs and DVRs had ad-block ages ago, and those were commercial products sold at regular retail stores, so it's totally a non-issue.
An ad-blocker just means I'm not running optional extras. The web server says, "please display X, Y, and Z," and the ad-blocker says, "nah to Y and Z, but I'll render X." It's the same idea as safe-search filters to block websites, but it runs within "trusted" pages instead of just blocking certain domains.
It's the same with sponser blockers, but I personally don't use them and prefer to manually skip them instead unless the creator generally has good recs (e.g. I often watch them once/twice on Gamers Nexus, because they only recommend good products, but block the others).
Piracy is sharing content that you don't have the rights to share. Ad-block just blocks content you don't want to see. Those are not the same thing at all.