Implementation will be hard. Having the mic on all the time drains battery. Storing the data offline and uploading discreetly when the device is plugged in will

Implementation will be hard. Having the mic on all the time drains battery. Storing the data offline and uploading discreetly when the device is plugged in will be discovered quickly. I think on-device voice recognition has come a long way nowadays so with more powerful phones, one of the big companies might try this soon.