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Google extremely obviously did not use the name Oreo without asking for permission

Indeed, and the biscuit company may well have paid Google for the advertising.

From the last time this was asked, they asked permission. With KitKat, they paid - someone linked a citation for it but it's not in my history.

What I read at the time is that no money was paid to anyone. Hope you find the linked citation

I stand corrected. Well, at least I am not seeing their source.