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They don't like to admit it, but Signal has a metadata problem. It's fine if that's not their threat model, but I wish they would be more clear about it, especially when other chat systems get criticism more often for precisely that aspect.

Edit: "As far as we can determine, practical privacy preserving contact discovery remains an unsolved problem." -03 Jan 2014

[0] https://whispersystems.org/blog/contact-discovery/

The kind of data they hold is legally within the reach of authorities and would allow metadata analysis similar to the NSA's former phone metadata program.

> 1. Billions of people live in countries which do not have jurisdiction over Apple, Google, etc.

Alternatively, you could say that billions of people live in countries with no restrictions on espionage of these companies, and with no recourse. Has NK faced justice for the Sony hack? Has the US faced justice for taps of overseas cables? No on both counts. If anything, having your country be a member of PRISM grants you as a citizen greater protection over how that data is used against you by that government.