They theoretically could play this role, but others are much better at it. These companies are structured to exploit scientists and the public, not to enable them. Innovation is stifled both within and without. We're much better off turning to fresh approaches to peer review, for example any of the things on this list:
https://docs.google.com/document/d/1HD-BEaVeDdFjjCNFkb0j3pvw...