At least with folding at home they have set the covid19 research as top priority for all of the clients (regardless of the clients preference).

Note - as far as I know there are no covid19 CPU based works units, so you will continue to get normal work units if you have CPU slots available. This is worth mentioning, because by default the client adds your CPU to the available slots. On linux you have to go into advanced settings to enable the GPU at all, so it is something to watch out for.