YouTube tests server-side ads to make your coveted blocker obsolete
downpunxx@fedia.io to 
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YouTube has been spotted testing server-side ads, which could pose a problem to ad blockers.
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downpunxx@fedia.io to downpunxx@fedia.io to
You also get SponsorBlock and Return YouTube Dislike right in the app (+ many other ui and functionality modifications)
I have premium and still use it just for this.