I have big issues with Microsoft, Apple and Google. Obviously, there are concerns with Amazon, too, but they aren't as significant for me. They stem mostly from not being able to read anonymously, and from the concern of DRM and the potential issues with Amazon being able to revoke the Kindle books you purchase.
Amazon's basic business model is not focused on surveillance or putting all your data in the cloud or vendor lock in. This is a big plus these days.
Amazon also is in the interesting position of probably being able to disrupt literally all commercial and retail business in the next couple years, which I am personally hugely excited for. It will be interesting to see who the heck buys this, and how they are able to operate without Google, iOS apps, what have you.
Maybe we will soon have a major tech company promoting Open Street Maps. Amazon will be in a position to offer a lot of products that other companies can't. Right now, though, I wouldn't touch the Google Play stack with a 10-foot-pole.