I would be Intressted in this since I might work on something in the Future that would Fall under the same Legal Question. The Concern rancoud2 and I have most likely are Copyright violations, how to not take responsibility for the abuse of the Platform/Service. (deleting Violations of Copyright ofcourse)
Technicly speaking it would be a Copyright issue if I would take a Marketplace Item that consist of a single Blueprint and Copy Paste it publicly here or on BlueprintUE as Example. Right? Its not the Asset itself but enables others to recreate it without effort on their end.