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YouTube is slowing down for users with ad blockers in new wave
(9to5google.com)
This is a most excellent place for technology news and articles.
YouTube already has ways to block users with adblock. They just haven't fully rolled it out yet.
Lately they blocked playing videos when I had uBlock Origin running, but it was just a warning I could click away. They might also slow down page loading and playback.
YouTube has the ability to lock users with adblock out, they are just very careful about using it. Mostly starting with trials in smaller countries and getting more bold over time.