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On the one hand, I agree with you. On the other hand, the false positives (and the fallout from it) might outweigh the negatives: imagine a volunteer doctor who disappears in West Africa due to being kidnapped/robbed etc and someone local tries to contact the family back home, but all the messages end up getting blocked.

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Something simple like a face match or even an email unlock if you connect to the account from an unusual location should work. A lot of websites do that already. So a volunteer doctor from the US opens their phone in Lagos, gets challenged, answers, Meta now knows that Nigerian IPs or whatever VPN they use are fine.

This seems like such a contrived example.

By all accounts the Dr would probably be in better shape if the kidnappers weren’t able to contact their family.

It's not the kidnappers trying to contact the family in this case. It's the clinic administrator who doesn't know why their doctor hasn't shown up for a week

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