The OS was hacked, big distinction there.

Also, they would have to actively target your phone for surveillance. I'm much more concerned about the passive interception aspect, and I don't for a second believe that I'm preventing myself from being surveilled.

The fact that they should have to go out of their way to break the 4th amendment is important to me.

The thing about endpoint-to-endpoint security is that it really sucks if one of your endpoints is compromised.

The "Signal" was not broken & the encryption worked, the part that didn't was when the encryption was removed and the user presented with plain text.