Yes, it does. Each Datasette Cloud user gets their own dedicated container, run using Fly Machines.
The core Django app manages SSO and team creation, then calls Fly APIs to create volumes and machines for each team. I'll be writing this up in a lot more detail soon.
I'm finding stability on Fly is excellent for my deployed containers.
The problems I've seen are more around deployment - occasionally there will be incidents where fresh deploys can't go out for a few hours, all of which are reflected on https://status.flyio.net/
