Sometimes they screw up, as all people and companies do, but in general Google's existance makes markets more efficient.

I try to teach people about said markets while actively learning myself. Certainly I have done well, and those I have worked for have done well, but I sometimes wonder if the advice I give helps people get away with being more lazy and promoting more garbage OR if it helps them make markets more efficient.

I hope the later of the two is occuring, although I have no way to guarantee it.