S3 IS FILES, BUT NOT A FILESYSTEM

Summary from the TLDR newsletter

The idea that Amazon S3 is really an 'Amazon Cloud Filesystem' is a bit of a fiction - it isn't a file system and it can't stand in for one. S3 implements a completely different arrangement and its primitives are only partly compatible with the Unix file API. It has fewer functions and can't do some tasks, such as overwriting files partially. This means that filesystem software, especially databases, can't be ported to Amazon S3.