The underlying protocol is peer-to-peer sync, so the mesh is really just a bunch of geographically distributed servers that sync between each other as needed an

The underlying protocol is peer-to-peer sync, so the mesh is really just a bunch of geographically distributed servers that sync between each other as needed and act as "one giant syncing & persistence peer" for your app - mostly so you can sync stuff between devices even if they're not online at the same time, and to use it like cloud storage (I like to call it "S3 for collaborative data")