Re: You give them everything and even pay for your own subjugation
The data never leaves the iPhone's secure enclave. Besides, unless you have managed to fly under the radar by avoiding government buildings and various public places in major cities like NYC and London that already have facial recognition technology tied into their security cameras your facial biometrics are already on file.
If you've ever been arrested, joined the military, bought a gun (in the US) or applied to get past TSA lines more quickly they have your fingerprints on file as well. It is much easier to use your fingerprints on file to break into your phone than to use facial recognition data to do so because of the depth sensing. Though of course if the government is willing to devote enough resources to you, they'll find a way.