Because Google doesn't have much of a financial interest in that kind of paper. Drug companies have a financial interest in studies that evaluate their drugs.
If you want a CS analogy, the google-co-authored papers about internet policy do get a lot more scrutiny. And rightfully so! That doesn't make them bad -- many of these are written by friends of mine whom I hold in great esteem -- it means we have to be aware of the potential for all of us to be influenced by the money.
If you want a CS analogy, the google-co-authored papers about internet policy do get a lot more scrutiny. And rightfully so! That doesn't make them bad -- many of these are written by friends of mine whom I hold in great esteem -- it means we have to be aware of the potential for all of us to be influenced by the money.