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Passkeys Explained: The End of Passwords
(sentientrant.com)
This is a most excellent place for technology news and articles.
I think that's the problem right there... If you share accounts across multiple people you have far greater problems than how passkeys work...
Or they're using it as intended. I've had more than one account I've gotten by cost sharing with friends. That's not a problem, that's a solution.
And it only takes one person with a grudge to cause a problem. I have seen it. I have shared accounts but very carefully and if someone abuses it then they permanently lose access to my stuff even if they are family.