That is a cool map!
I'll contribute another one. It is not a CoViD map, it is an early indicator.
There is a company called Kinsa which makes a thermometer for home use. It is bluetooth enabled and connects to a phone app, which then uploads data to a server. A lot of people have bought them across the country.
Kinsa anonymizes the data and provides it to Oregon State University which maps it. So far, it has served well showing increases in fever some days before CoViD cases are diagnosed. It also clearly shows the lockdown has reduced "Influenza Like Illness" nationwide.
You can drill down to the county level on that map:
https://healthweather.us/?mode=Observed