It's hard to overstate what a nothing-burger this article really is! Let me break it down:
- Signal got $3 million from the Open Technology Fund at some point in its development
- Some anonymous source alleges that the OTF's ultimate goal is to promote US foreign interests
- The current chairman of the board Katherine Maher worked at the National Democratic Institute and Wikipedia before
- The same anonymous source says she was recruited because of connections to the OTF
- She has at some point voiced the opinion that a completely free internet without regulation just reproduces existing power structures, and that balancing regulation and 1st amendment rights is a tough problem
- Signal doesn't have reproducible builds on iOS (it absolutely does on Android btw)
- Some people feel like Signal chats come up more often than they should in court cases and media reports
That's it, that's the whole story. That's the reason why the Telegram guy of all people thinks you should be careful, and better use his chat service instead, and the Twitter guy agrees.
I mean, reproducible builds on iOS would be nice, but that platform has much bigger problems from a privacy/security/sovereignty/freedom standpoint anyway. And the rest is just nothing turned up to 11.
Here is a more detailed explanation of the exploit.
So hardly an attack on any core system of cryptocurrencies.