If anything, it'll be a thing where amazon ends up close sourcing the code/parts that they create after forking whatever OS they decide. That, or they'll just close source the entire codebase 100% before release without any regard or repercussions.

it won't take long for someone to build a Wamazon Linux distro with all the features and none of the crap.

I don't know what "features" Amazon would include that aren't somehow directly tied into their store and ease of shopping...aka "crap." It's not like they would build a better video/audio driver or something. It would all just be more...advertising and analytics, probably on a cheap platform as hardware has never been their largest source of income, to include Kindles (AWS is, last I checked). Strip those two out of their build and we have essentially an untouched kernel lol, at least that's how I see it happening.