Comment by TeMPOraL

Giant companies don't use do ad campaigns anyway. They hire ad agencies, which themselves may hire smaller ad agencies or consultants, and those are more than happy to innovate and improvise using whatever trick can come across.

Note, I said companies, because brands at this point are merely labels, most of them throwaway; big companies use them the same way small companies do, including to run fly-by-night scams on burner brands. They're more than happy to delegate it to smaller agencies, too.

Point being: there's not much correlation between branding, ownership structure, and what advertising techniques can be applied by what organizations.