| If you read into the federated technology they've been deploying I'm fairly comfortable saying I agree with their decisions. Let's take a look at the "Now Playing" architecture available on Pixel devices. At first glance by a critic you think "You're crazy for giving Google permission to have your microphone always on and listening for songs you're hearing, privacy this privacy that". If you read into it, you'll be comforted to know they've built a model to generate signatures clientside which are able to be compared on-device to a list of signatures which are similar to it. Then as far as I understand, they are able to take signatures which contain no discernable audio data and use those to discover new audio trends. > On Pixel 4 and later phones, the counts of songs recognized are aggregated using a privacy-preserving technology called federated analytics. This will be used to improve Now Playing's song database so it will recognize what’s playing more often. Google can never see what songs you listen to, just the most popular songs in different regions. Privacy-preserving, user-beneficial, and useful for advertising targeting if you haven't opted out of interest based ads. |
But once you have given them access to your microphone, you have to trust that their software does what they say it does, without mistakes or bugs (whether in design or implementation) or accidental security vulnerabilities (possibly maliciously introduced by the NSA or who knows).
If you do not give them access to your microphone (assuming the OS access controls are themselves working; but that's a much smaller attack area), you do not need to understand trust anything.