They were using AWS. They have moved off of it within the last couple years because they now have the scale where it makes financial sense to build their own infrastructure and also to provide a better, faster service. They've had improved read/write + sync speeds since switching over to their own infrastructure. Having those checkboxes in a table showing that you have the fastest cloud storage works really well in B2B, which has been a big focus for them recently.

They did, but I imagine it was really expensive vs building their own stuff at that scale. Plus they probably don't want to be reliant on a competitor in many ways.

Early edge network was indeed prototyped in AWS: a simple setup with ELB in tcp mode, nginx and proxy_protocol.

Once we've got all data from that experiment: performance, cost, and flexibility included, we've decided to start building our own PoPs.

"Just" using AWS isn't going to solve any of the problems this article describes.