i have several clients with xp systems (or even older), still, mostly for CNC applications, bulk trailer and tanker loaders, and similar. i keep recommending upgrading the systems, they keep balking at the high prices from their vendors.
That seems to be the same decision our company has made on some stuff. In a way the old licensing model really hurt some businesses. They got so used to spending once and holding onto stuff for so long they basically cut the budget for maintaining and upgrading the same systems. Now it's all considered profit and there's no way will they let that money be purposed for something that, in their eyes, still works.
Not as prevalent these days, but a lot of EMR/EHR was built on XP. Some of those companies went out of business and the clinics using the software never upgraded because they couldn't get the data out into another system.