I believe once you can start using your cryptocurrency as collateral for a loan, this space is going to go into the trillion(s).
check out Salt Lending. I know many waiting for it to open so they can get a 100k loan and put it back into crypto. This project has been fully licensed and regulated, and owned by the founder of shapeshift (erik vorhees)
honestly, this seems like a grey area and I have no idea! but the concept of this platform is amazing, and has already been approved. They are taking SALT deposits currently (just opened a few days ago) so they are ramping up for full operation soon. I would suggest to hit up their reddit...i'm gonna do the same :-)