You'll know if the reviewer is sponsored by the game, because they legally have to disclose it. ACG probably takes one or two steps more than necessary to prove he's incorruptible.
The type of person who buys Arkham Knights or Babylon's Fall despite the plethora of warning signs is either such a fan of Batman or Platinum that they can't help themselves, or they're like my friend who needs to see every major shit show in gaming. Neither game sold many copies.