From some of these posts and from those in other threads, I suspect that some users are checking for driver updates by using the Windows Update option in the Start Menu Settings control.
Or perhaps they are relying on third party software updaters or their computer manufacturers performance scanning and "tweaking" tools. I use the latter tool to keep my system drivers (e.g. Bluetooth, wireless, Intel devices, etc) up to date but for my video card drivers I only ever go straight to the source, Nvidia, for the updates.