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Where the SDK pulls its data from is not hardcoded.

The SDK is just a library, used to render vector map tiles, usually in the MVT-format: https://docs.mapbox.com/vector-tiles/specification/

Most maps rendered with such an SDK are based on OpenStreetMap data.

As others stated, this demo dataset is pretty simple. I believe it's only using Natural Earth data (https://www.naturalearthdata.com/). The primary focus is on the rendering library.

OpenStreetMap in the form of OpenMapTiles: https://openmaptiles.org/

Doesn't need to be OMT though. That's just the de facto free & open source tile generator from OSM data.

OpenStreetMaps probably.

Mapbox uses data from OSM among others when they create their tiles. https://docs.mapbox.com/help/getting-started/mapbox-data/#co...

OpenStreetMap* (no s at the end).

Sorry :p It’s ironic because I had a friend once—well we shared kitchen and bathroom in the student housing, flatmates of sorts—that used to refer to Google Maps as “Google Map” and I never corrected her because I just found that adorable for whatever reason. Lol.

Good thing it's all digital. Unfolding one big Google Map would take a looooooong time...