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YouTube is now flagging accounts on Premium family plans that aren't in the same household
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
I don't know if this actually does what I hope it does, but if I happen to watch a video that I don't want recommendations on in the future, I manually delete the video from my watch history.
I don't know if that really helps, but at least as a placebo it feels good to do.
If unsure of a video, 1. on desktop open in new tab - if ya don't want that content/creator click the 3 dots on the main page video and select don't suggest channel, on phone (just did this a few mins ago) back out of video and since on mobile the home feed doesn't reset hit the 3 dots etc