There is a big difference between buying a perpetual licence with extra yearly support packages versus leasing the software with on a subscription model. While the two options may appear to be the same thing, the first one doesn't remove your ability to run the software once you stop paying for support.

The best way that I have to describe it is in the first option you're buying a version of the software and then paying for updates and bug fixes in a flexible manner, while in the second option you're leasing use of the software for as long as you continue to pay.