I'd like to share with you my intension for this amazon + google search feature.
1) It's from my need. When I search some shopping items from google, I always want to check them in amazon also.
2) It can help us make small mount of money.
3) I provide an option to disable it.
However, I did it in a wrong way. I should did it like this: 1) Disable it by default. 2) Ask user's permission to enable it 3) Tell users why we add it.
I did it wrong but still respect users. This feature exists only one day and I removed it in the new version(3.2.1).