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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.
using the browser isn't necessary to keep your watch history up to date.
yt-dlp can log in as you by reading your cookies from your browser, and, with the optional --mark-watched flag, mark your downloaded videos as watched in your YT account.
TIL. Thank you very much. Looks like I'm going to be using that if YouTube gets even more painful.