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YouTube might slow down your videos if you block ads
(www.pcworld.com)
This is a most excellent place for technology news and articles.
I already do this. There are several apps for it but I really like Pinchflat because it has metadata settings for Jellyfin.
All I have to do is add a video to a playlist and it gets automatically downloaded. I use it for archival but there's nothing stopping you from making it the only way you consume YouTube content.