First, consider that no rational person or business would spend money on any marketing that isn't ROI positive (because then they would just be losing money).
Google and businesses aren't amenable to just sharing all of their confidential marketing data, but here's a birds' eye view:
Colour me unimpressed with a marketing document, unaudited that is literally selling the service. Without saying google are or aren't a con or having any view on it in the absence of real data, Bernie Madoff had marketing documents. There's a good reason to want, actual data.
Businesses do irrational stuff literally all the time. There is no business that has ever existed that was always wholly rational.
Google and businesses aren't amenable to just sharing all of their confidential marketing data, but here's a birds' eye view:
https://economicimpact.google.com/