This is a very good point. However, nothing can protect you against a NSA-level adversary. Signal is designed to protect you against Google or Facebook.https://twitter.com/RealSexyCyborg/status/1347455529241612294 …
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Of course if the code has a bug they can exploit it, but it's designed to be a small system with a very small surface area to exploit, and verifiable code. You are many, many orders of magnitude more likely to be secure on Precursor than on a random Android phone.
please allow me a little joke: you'll be more secure on anything not being a random Android phone. (not only because Android's many flaws, but also bad practices of phone manufacturers, carriers and users)
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