Earlier quoted context omitted.
surely shazam will realize when one IP address is responsible for 1000x a usual person's bandwidth? or, given Pixel phones can identify audio in the background seemingly without impacting battery, are modern algorithms for identifying music from audio so efficient that shazam pays almost nothing per clip?
At least with the recent Pixels there's an option to have your phone listen 24/7 and tell you what music is playing. Probably difficult to distinguish this tower from a homeless guy sitting in a subway station listening to different music all day.
Now Playing has a smaller database than Shazam does but the technology would work fine with a larger database if you wanted that, which for this application you might.
However, unsurprisingly Google did not give away the technology.