And in more COVID-19 related news a UK based app for reporting COVID-19 symptoms for research https://www.digitalhealth.net/2020/03/kings-college-london-covid-19-app/
The article is careful to state that "Any data gathered from the app and study will be used strictly for public health or academic research and will not be used commercially or sold. " It also makes it clear that data gathered will be used for research which goes beyond COVID-19. How transparent this will be to app users is not clear.
NZ has a flu tracker in conjunction with Australia - apparently over 40,000 report weekly: https://info.flutracking.net/. It doesn’t look like a special COVID-19 tracker has been launched yet.