It's when a site is able to take a variety of Javascript-accessible state that in isolation is benign (such as your reported graphics driver, as the case here)

It's when a site is able to take a variety of Javascript-accessible state that in isolation is benign (such as your reported graphics driver, as the case here) but together form a unique identifier for a user given the high dimensionality involved. This allows identifying users without their consent and avoids some methods of anti-tracking.