Anything you plug into your computer is going to have some driver associated with it. Even a generic one. The monitor has a MAC address and other data that announces what it is. Your OS sees this and tries to use the appropriate driver’s for the device. Windows will go so far as to try to fetch the drivers via Windows update to keep the device up to date. This is not a bad thing. It’s bad when LG betrays your trust by using it as an attack vector to install spyware. That’s what happened.