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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.
They don't care about whether they live with you or not. It's about providing less service than what you're paying for. Like how mobile carriers say, "unlimited data*" -- *after 25GB, we [may] slow your connection speed to 256kbps. So this way, it's "5 accounts*" -- *they must physically live with you. So now you're paying for 5 accounts, where 3 or 4 of them technically are unusable.
Why? Money. Those other people who you would have shared with now need to get their own account(s). Suddenly, "profits are through the roof!" -- until the next big squeeze. At this point, Google is squeezing its customers like a dry tube of toothpaste.