ARC reviewing question

Got an ARC from netgalley, and seeing as I don't have a book blog I don't get all the requests. Obviously.

I gave this book a good review and rating and the author actually messaged me asking to put it on amazon. But I don't want to put ratings on amazon. I'm not even buying books from there any longer. They have approved exactly one of my previous reviews there so I just stopped trying.

 

Any thoughts?