That will hurt businesses who rely on mail advertising.
They should install good stamp machines. The ones at my local post office used to be called Las Vegas and Atlantic City. That was before they died completely after digesting lots of people’s money.
They could also get rid of Grand Central Station. That’s prime real estate. Erect a high-rise office building or office/residence building and that will support the rest of the system.
That will hurt businesses who rely on mail advertising.
Possibly but I doubt the stores get much revenue from the junk mail. I trash all I get and never look at it except for local grocery stores that I shop at. And they keep those flyers in the stores for shoppers anyway.