All of what you say makes sense to me, but one thing still bugs me – is it not true that reviewers live and die by their reputation? If they brown nose publishers to not lose out on first mover advantage, to the point where they’re essentially aiding and abetting a bait-n-switch, does that not hurt their standing with the consumers of their reviews? Aren’t they in the trust business? Are their revenue streams so dependent on the good will and reach of publishers that essentially they are forced to be shills? I genuinely have no idea how this works, but it sure does seem odd to me.
I’m still curious about what potential legal ramifications there might be for a reviewer saying a product is great when in reality it doesn’t even work, and they know it.