Post author here! Yes, most apps have to create their own tile or download server at the moment. We’re hoping that our tiles will be useful to the greater ecosystem, in the same way that our current raster tiles get used everywhere.
The nice people at https://download.geofabrik.de provide daily country-level OpenStreetMap extracts in the Shortbread schema, which is the same schema that we are going to use for our live tiles.