Everyone has an axe to grind and a product to promote. Microsoft put this effective video together to promote Office 365. Before they can promote their product, they felt they needed to demote the competition. Anyone who thinks keywords aren't being pulled from messages being sent is very naive. A free service generally asks for something in return. In the case of Gmail, they advertise based on words they skim through messages you send out.
This video illustrates why you are probably receiving notes about products you have no interest in whatsoever. When machines and automation become involved, accuracy is bound to suffer.
Having said all that, the video is well produced in the style of a Saturday Night Live or Mad TV parody and well done.