It really depends on the vendor. Big names are at least careful enough to do that. The bottom of the barrel white-label vendors often don't care. I wouldn't be

It really depends on the vendor. Big names are at least careful enough to do that. The bottom of the barrel white-label vendors often don't care. I wouldn't be the least bit surprised if some of those Windows installations are using pirated keys. It's perpetually concerning how bad the state of systems like this is. A grocery store near me recently deployed a brand new set of self check-out counters...running Windows XP. Amusingly the credit card/debit card reader is running Linux and shows the old-school penguin image on boot.