Depends on the service, and timeframes. For geforcenow, you also need to consider the upgrade cycle - how often would you need to upgrade to play a newer game? I'm not sure but probably at least once within that 8 years. Buying a new car, or almost new car, and driving it until it falls apart is a better financial option than leasing. But if you want a new car every year or two, leasing is more affordable - for that scenario. Also it depends on usage. My brother in law probably plays a video game once every other month. At that point, on demand pricing (or borrowing for me) is much better than purchase or consistent subscription. You need to run the numbers.

Depends on how much you play. geforcenow is limited to 100 hours a month, with additional hours sold at a 200% premium. This dramatically changes the economics ( https://www.techpowerup.com/344359/nvidia-puts-100-hour-mont... has a handy chart for this )