If it did happen, then good. It is high time Amazon enforce its own policies. Keywords should only be for the actual content of your book. Unless your book is how to become a bestseller, bestseller should not be in the keywords.
Amazon search is completely broken. And it is broken because A. everyone just does what the heck they want regardless of the TOS and B. to date Amazon has allowed everyone to do just whatever they want without consequences.
And the problem is that this isn't just a books issue. It is about trying to find ANYTHING on Amazon. The entire store is becoming impossible to use unless you have a manufacturer product number to search with. Amazon used to be my first place to go to find stuff for the office. I used to be able to get replacement florescent bulbs, emergency back-up batteries, replacement parts for tools, and all sorts of stuff for our workplace easily. Now it just takes too long to find anything so I just go to Grainger or MSCDirect or another vendor.
As a customer I love Amazon, so I desperately hope they are taking action to clean their house.