Sure, but right now any mid-level mangler can hire "bobs discount SEO, advertising, and snow clearing" to run some Google ads for them, and move on. If Bob has to get the manager to get approval from IT to subdesignate or add a CNAME or whatever they need, it's a huge additional friction.
I think many people think that advertising is "Kohl's goes to Google and buys an ad" - it's much more often Kohls hires an agency that hires an agency that manages a independent company that fills out the actual ads, and they all want to track their piece of the pie.