For me it's the opposite. I regularly update goodreads to keep track and share with people whose recommendations i value. Most people don't read only on kindle and only from amazon.
There are two sides to this : goodreads clearly needs a better interface and reviewing system on the one hand, on the other hand, what if amazon decides to restrict it to content bought from amazon?
I hope the site stays independent and is not merged into amazon
It wouldn't make any sense to restrict what people list only to what Amazon knows they bought. For one thing, a friend could have bought a hardcover from Amazon and gifted it to me in person. Amazon's objective is to sell you more books, not worry about where you bought your last one.
There are two sides to this : goodreads clearly needs a better interface and reviewing system on the one hand, on the other hand, what if amazon decides to restrict it to content bought from amazon?
I hope the site stays independent and is not merged into amazon