Note that unlike FILE0, S3 not only charges for storage, but for write requests, read requests, network bandwidth, and some less obvious niche things.

So it's not a 1-1 comparison.

If you don't see the value in this extra convinience you should stay with your current service! The goal of FILE0 is not to replace these big players, but to provide an option to folks who just want to get things up and running quickly and don't want to think about infrastructure.