What do you mean by static?
Yes, the tiles for our locator maps [0] are self-generated and hosted based on OSM source data and the OpenMapTiles project.
The boundaries used for choropleths [1] are maintained by us based on various public sources (NaturalEarthData, OSM, government data, …)
[0] https://www.datawrapper.de/maps/locator-map [1] https://www.datawrapper.de/maps/choropleth-map