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Even State Department-funded Human Rights Watch admits that authorities combine legal and illegal methods to obtain convictions: https://text.hrw.org/report/2018/01/09/dark-side/secret-origins-evidence-us-criminal-cases
Combining dragnet surveillance with device hacking is intended in the design of both tools. Hence, State Department-funded Signal dupes you into handing over your identity as part of the population-centric mapping. In custody, your phone will be hacked when it is taken away if it's important.
https://xcancel.com/hannahcrileyy/status/2034273723667161480#m
Sorry but both points are irrelevant, nonprofit foundations can still be forced to turn over user information. That is part of following the law so nothing that would need to be hidden to auditors, unless you were talking about encryption audits which is completely besides the point
What data is there for Signal to turn over? Can you prove that they're keeping messages or logs on their servers that have 'disappeared' from all the associated devices?
Your entire social network graphs, and timestamped message history.
The audits determined they don't have any user information to provide. You can see this in previous government requests where the only thing provided was a timestamp of last connection to the network.