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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.
YT forces me to login if I am using a VPN these days, if I use Firefox or Safari. Brave avoids this. I will have to try Mullvad.
Try a different VPN server if you get the "Sign in to confirm you're not a bot" error. If you're using Mullvad VPN, the Netherlands Amsterdam 203 server should work.