It kind of makes sense. There are ads for products you can't buy at stores that are closed, for cars you won't need to commute with, insurance you're already not using, other goods that won't ship for a month, and small gadgets that are totally out of stock; and that's assuming the person viewing the ad isn't avoiding spending due to financial risks.
If ads aren't converting viewers into customers, it doesn't matter if there are 2x or 20x more viewers than there were before, the ad placements are just worth less.