I think it's really a political thing. How many of these open datasets come with a license/disclaimer that you are also allowed to rehost the data in its entire

I think it's really a political thing. How many of these open datasets come with a license/disclaimer that you are also allowed to rehost the data in its entirety for redistribution? It's one thing to standardize a format for open data, it's another thing to be able to make that standardized format available to everyone if you're repackaging someone else's data.