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> they're illegally subsidizing their search and maps business with... [their ads business]

I suspect this is what what @arrosenberg is getting at. If the Search (and maps) business is considered separate from the ads business (Search runs at a massive loss) and it's provided for free because they can subsidize it with the revenue from their ad business, then it's an anti-competetive advantage they have from a monopolistic position that their advertising business has.

Anyway, personally I have no clue how that "works" in practice, but that seems to be the perspective.