It's seemingly closer to $6b for that year, which is obviously a ton of money, but considering they employ north of 50,000 people, if each person costs them $75,000/yr that's already $3.75b. NYC spends $2b on just their department of sanitation. It's a city with like 8.5m people, everything costs crazy amounts of money.
https://council.nyc.gov/budget/wp-content/uploads/sites/54/2021/05/NYPD.pdf
https://council.nyc.gov/budget/wp-content/uploads/sites/54/2021/05/DSNY.pdf
Just got a Mac last week, and was able to set up file sharing with my PC in less than 5 minutes last night. In fact, it was way easier than getting the sharing working with my Surface, which refuses to acknowledge my desktop's existence.
I don't generally encourage buying a Mac, I'm not at all convinced it's worth the price premium. I'm only commenting insofar as I have context.