Yep, this would be useful. As allergic as I am to legalese, I know some businesses that could really use Expandrive, but they'd need to know privacy policy on how files are transferred. (When connecting to OneDrive, OneDrive permissions say that Expandrive needs access to files even when Expandrive isn't running, which sounds a bit scary & nonsensical.)
Aside from that, Expandrive looks amazing and like it will solve a great many problems.