[amiramir]

I suspect you are being slightly tongue in cheek about the bandwidth for ads (yay 5G ;-).) With that said, I think a key benefit of on-device learning is the privacy angle. The Pixel 2's always-on song identification is said to be done on the phone without your audio data being sent to Google. Similarly the Google Clips camera apparently does its magic without sending image data to Google. With devices having less to differentiate on privacy is increasingly visible in the marketing arena particularly for devices that seem to be watching or listening at all times.