It means they're a PaaS (Platform-as-a-Service), but instead of hosting your webapp on one VPS in a Frankfurt datacenter, they replicate your webapp (and databases!) all over the world so that latency is as low as possible for your end users and there is not one SPoF (Single Point of Failure).
So they sense if your docker thingy has a db (could be any flavor of db?), and they figure out db replication across all the “edge nodes/firecracker thingies” thru deploy for your app?
