It looks like the policy of operating overcrowded subways and buses during the epidemic was unintentionally a successful pox party; preliminary results show 21% of New York City residents test positive for the coronavirus:
I suspect the number is even higher for regular subway riders. It looks like New York City is approaching herd immunity.
It also means that the death rate is lower than earlier expected. Applying the measured rate of positive results to the whole city mean 1.7 million were infected. The total number of coronavirus deaths is 9396, which gives a fatality rate of about .5%.
While epidemic in New York City has certainly been terrible for the people who have fallen seriously ill, the fact that so many people are testing positive is good news for assessing risks of serious illness in the city and the rest of the country.