Without the regular traffic, the subway and some TTC routes, particularly the 501 and especially the 505 streetcars, have become rolling shelters for maskless, non fare-paying bums, who will often beg for money, lie down on seats, and cause minor disturbances. I had to take Line 2 recently, and one guy - no mask to be seen - was getting close to passengers' faces with a begging cup, then passing from car to car while the train was moving. Now that most of the "choice" ridership is gone, working/studying from home, or driving to work, and not going out for leisure, that leaves mostly essential and low-income industrial workers these days needing transit.
It's likely the result of minimal enforcement - with TTC operators instructed not to intervene, especially now that they're isolated in their cabs, the loss of paying customers, the loss of other indoor spaces to congregate like drop-in centres, dive bars, and the sort.
