Google definitely has the ability to do that, but I don’t believe it’s currently happening. First, it could get them in pretty big trouble in parts of the world that have the concept of consumer protection if anyone ever got ahold of any proof (and Google seems pretty terrible at keeping secrets). Second, have you seen ANY negative review of a phone? Every time I was researching which phone to buy, all the reviews were always very positive and avoided talking about its weak spots.

For example, my old Nokia 5.3 - every review I found, both in English and in my native language, made the phone sound like it is an acceptable phone for its price - nothing terrible and nothing outstanding. I doubt most of them even tried using half the features, because the rear fingerprint scanner was completely unusable (it got a nice 50/50 success rate if the air was dry and I had perfectly clean non-sweaty fingers, and plummeted down to maybe 10% success rate if any of these conditions wasn’t met), the touchscreen had ghost touch issues in even slightly humid air (meanwhile other phones work fine even with droplets of water on the screen in light rain), the camera app took 5 - 10 seconds to be able to take a picture from cold start (and Nokia/HMD didn’t bother to keep it in memory like other OEMs).

The last point might not sound like much, but it actually made me pretty much stop taking photos because anything that moves at all was simply a no go unless I had quite a bit of time to set up. I took a grand total of 732 photos and 28 videos over the three years I had that phone, which is ridiculously few compared to the over 6k photos I took with my previous Xiaomi phone. (talking about the 8k photos I took in a single year with my current phone would be cheating, literally any phone camera would look like a technical miracle to me after Nokia’s shitshow).

(edit: also, after one of the updates, the camera app would often get killed after taking a photo and the photo would be lost - so if you really wanted to take a photo of something, you would often have to try several times until it actually saved it. This was never fixed in the later updates, and the final update even introduced a fun feature where factory reset is now guaranteed to irreversibly brick the device in case you wanted to sell it. This is confirmed by HMD to be a wontfix because the phone is now EOL)

Oh, and the promised updates (it was Android One ffs) were all about a year late and generally very poor quality (also security updates were sparse), but that’s not something a reviewer could tell at the time.

Sorry about the rant, my experience just made me really hate HMD/Nokia. The main point is that all the reviews were incredibly positive even for a crappy phone and a brand that doesn’t seem to be paying off the reviewers - even tiny local reviewers who couldn’t have possibly be on HMD’s radar were way too excited about it.

And my last point: we’re not talking about reviewers here. This is about “#TeamPixel”, Google’s “organic” marketing campaign. They get a phone and hype it up, they’re not even meant to compare it to other stuff.