While this works for Google Search (to my knowledge, search ads are still exclusively contextual) most contextual ads only work in limited situations - random b

While this works for Google Search (to my knowledge, search ads are still exclusively contextual) most contextual ads only work in limited situations - random blog websites or things like quizlet don't really have any related products you could advertise on based on the domain, while people might still be included to (for example) purchase an Amazon item they viewed a few days ago.