Seems to be quite Europe focussed, but then again 'Dienst" is Dutch for "Service". It's a project of the university of Groningen [0]
[0] https://www.rug.nl/society-business/centre-for-information-t...
[0] https://www.rug.nl/society-business/centre-for-information-t...
But in this case perhaps much of that data came from a data import that didn't have compatibly-licensed data for the US.