Earlier quoted context omitted.
You can use the same argument for flu deaths, heart disease deaths, diabetes deaths, etc. The numbers that you pay attention to are dependent on what is popular right now.
The difference is the rate of those aren't doubling every three days.
Using CDC's FluView app I looked at the 2017/2018 flu season to see what the doubling time was. It's not 3 days indeed. It varied quite significantly during the outbreak, but there were periods where it was doubling approximately every week. Potentially faster I suppose depending on how closely people were looking for it (not that close if I understand correctly for most flus).
Viruses can grow pretty fast.