Comment by perching_aix

> Pixel phones have a built in background audio fingerprinting service called "Now Playing" which can operate constantly.

That's interesting. Although can and does are very different things - appears to be a feature you turn on yourself. Upon a surface level research, I also found it to rely on an offline music fingerprint database, suggesting it doesn't retain and send off the audio it records, or metadata it extracted from them.

> Shazam has an "auto shazam" feature you can enable for constant background listening, since 2016 at least!

This is again a can vs. does difference.