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Basically, a good way to never trust "it's okay, the data is anonymized" again is simply knowing what the "Hemisphere Program" is.
https://www.eff.org/cases/hemisphere
In short, the US government got access to number from, number to, datetime, length and sometimes location information for every call passing through AT&T's network from 1987 to today.
Then they ran an algorithm to de-anonymize every burner phone based on behavior. They did this because maybe some of those burners were used by drug dealers.
I think if you really care about privacy then you basically have to run your own for people you know and trust. At that point it doesn’t really matter what it is. It also depends on your threat profile. If you don’t actually care that people know your contact network, then Signal or any other app is perfectly fine. For vast majority of people it really doesn’t matter. The point is that Signal isn’t a good solution for people who do genuinely care about privacy.
I think if you really care about privacy then you basically have to run your own for people you know and trust. At that point it doesn’t really matter what it is. It also depends on your threat profile. If you don’t actually care that people know your contact network, then Signal or any other app is perfectly fine. For vast majority of people it really doesn’t matter. The point is that Signal isn’t a good solution for people who do genuinely care about privacy.