This explains my search results, How Scammers in China Manipulate Amazon.

[BrianHG]

Enjoy:

[Bud]

"Only a small number of Amazon users are doing that" - really? fake reviews are everywhere on Amazon and are more of a rule rather than exception.

[ataradov]

Sure, let's single out China, it is so trendy now. Sellers from all over the world do this. Sure, in absolute numbers Chinese sellers are dominant. What can they do? China manufactures the product, obviously there will be more sellers there.

Amazon reviews are mostly useless. The only ones I pay attention to are the ones that include pictures of the broken or defective product and even then only to confirm my suspicions that it will break that way.

[Rick Law]

This is one of the problem of a big monopoly.  You just manipulate one and you've done it world wide.  This really doesn't serve the customers nor the sellers.

Personally, I think Facebook, Tweeter, Amazon, and Google/youtube should all be broken up.  Given their political donation budget which appears to me as unlimited, and their close relationships with a particular (USA) political party¹,  I doubt that would happen any time soon in the USA.

References:

[1] 
According to this September 2018 ZeroHedge Magazine article titled: Google Was "Working To Get Hillary Clinton Elected" With "Silent Donation" According To Leaked Internal Email
^{https://www.zerohedge.com/news/2018-09-10/google-was-working-get-hillary-clinton-elected-silent-donation-according-leaked}
According to this March 2015 Fortune Magazine article titled: Google averages a meeting with the White House every week
^{http://fortune.com/2015/03/25/google-white-house/}

[Rick Law]

...
Democracy vs GDP. Constant dilemma for politicians.
...

More like "serving my pocket book" or "serving my constituency"...   Bad part is, the constituency seem less and less important to them except a few weeks before reelection, and even then it is just mostly lip-service.

I judge a politician by the growth of their net-worth.  Most have their net worth growing in rates that us mortals can only dream of, and that spoke loudly about their loyalty.