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 SimpleX by default uses their call relay. You can turn that off. Signal uses their call relay for unknown contacts. You can turn it on for all. 
 hey thanks for your time to reply.   I think EP is doing a great thing with SimpleX, and I hope he continues to improve.  However, I disagree with SimpleX audio calls, when he literally put it in a web browser on Linux.  It should be within his secure client.  It looks like he just copied Jitsi, and who knows what browser the person is using with potential WebRTC leaks or malicious Big Tech sharing the same browser.

your point is 100% fair, however TURN servers increase bandwidth which can affect call quality.  So that's sort of like a double VPN.  You wouldn't need it if the original VPN wasn't so centralized where they become the new all seeing ISP.  So, the real fault lies on Mullvad and NOT SimpleX.

If that's the only criticism of the whole article, sounds like you'd like our thing