The program is called "Extended Security Updates for Windows 7", and the fee isn't exorbitant, but it's not necessarily cheap either. For 2020 it's $25 / PC, rising to $50 / PC for 2021, and $100 / PC for 2022. There's background here: https://docs.microsoft.com/en-us/lifecycle/faq/extended-secu...

Background: I have a Customer who needed to maintain Windows 7 support for a legacy application on a single computer. For $175 to get 3 more years out of a paid-for critical application it was a "no-brainer" (and 3 more years to figure out a replacement strategy). Obviously, not all situations will be as simple.

That’s cheaper per year than Office 365.

Which I would love to pay as a consumer Win 7 Pro user but unfortunately MSFT is not interested in that.

Win10 -- which I also own -- has horrible UI and takes the simplicity + familiarity out of Windows, and I just don't want to move any active work to it.

Mainstream support ended almost six years ago. But extended support (meaning those who pay the big bucks) (officially) ended in January this year after 10 years of support. Whether they still unofficially support those who pay even bigger amounts? I don’t know.