Agreed. I love Amazon prime, and also love Slack. But I fear the day when all of the "good companies" end up being owned by one corporate overlord.
Media:
http://libreria.sourceforge.net/library/Free_Culture/images/...
Food:
http://2.bp.blogspot.com/-7KY4dEnHmnc/U9bkkriu8hI/AAAAAAAAD9...
A large share of food companies owned by a single conglomerate.
A large share of retail, cloud hosting, and online messaging owned by a single conglomerate.
You're right that there's long been some serious consolidation in sectors, but those two examples seem a little different from Amazon grabbing up large portions of multiple sectors.
Also: https://github.com/amzn