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Is that really an issue? Its really a missing data problem. Your data is "missing" and facebook can infer with some probability you exist and the people your "shadow profile" might interact with.

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If six of your contacts have provided them with the same name and email address, then they know with near certainty that those six people have you as a mutual contact. When they spot an ad profile with the same email address, that comes with a dossier on your browsing and shopping habits, which are used to infer your interests etc. It's not a "missing" data problem, it's an embarrassment of data problem.

That’s pretty much all there is to it, yeah, just a missing data problem. But once you slap the “shadow profile” label on it, it gets “shady” and “scary”. A pretty cool lesson in how to make something fairly trivial and non-threatening seem scary to people.

Note: not currently or in the past employed by Meta or any affiliated companies, so that’s just purely my own take.

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