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YouTube is Losing The War Against Adblockers
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
No, it potentially impacts cpu power profile (if it's toggling between AC and DC because of a loose connection)
This would adjust throttling of the cpu, which could impact playback in certain cases, so it's possible. Likely other apps would be affected but OP was probably most often watching videos while plugged so noticed mostly there 🤷