I applaud your hard work. It's only natural that we seek reward.

However, from Amazon's point of view, they did not ask you to build it or have obligations to reward you. They did give you a good social credit but it seems you are interested in more that is not entitled to you.

Like you said they have zero obligations and that's where the conversation stops unless you actively ask to be rewarded. Talk to their community make a thread on their forums, make it known and carefully explain your vision and how they are falling short.