I suppose they want that Memorial Day holiday surge to be a real thing now. They don't want this to end, ever.
Along with that mask policy adjustment, there are a few extremely crowded places like the Ceder Point Amusement Park which says masks should be worn unless you are vaccinated but they will NOT be checking vaccination status. Everyone knows full well what that means. Those not vaccinated will simply claim they were and not wear a mask.
The spread of COVID will depend on 2 factors:
1. How dense the population is.
2. How dense the population is.