I've done all these things as an experienced writer and journalist but anybody could have done them. There are no bars to entry.
Amazon deserves a pat on the back for the efforts it's made to empower people to make their ideas a reality, whether that's somebody with a good idea for a book, like me, or somebody who wants to create the next Internet phenomena. Amazon is a personification of the spirit of the Internet, which is one of true democracy, access to the means of distribution, and rapid evolution.
So, next time Amazon's cloud suffers a blip, just remember how the world would be a poorer place if Amazon didn't exist.