Most of them are held up due to government, not technology. So no, no sarc tag required. Each one has had flying tech demonstrators for years.
IIRC, Moller only flew on a tether under a crane. Moller is a very capable scam artist. I’ve seen a progression of “The Future is Here, NOW!” magazine articles about Moller for what seems like 30 or 40 years. He just puts a swoopier fiberglass body on it every decade and gets a new crop of followers.Work the physics of airfoil thrust and fuel weight to power conversion - it ain’t gonna do what he claims.
As far as “held up due to government”, that may apply to “certification”, but you can do almost whatever you want under “Experimental” category. Lots of people have made money selling plans & kits of their strange and wonderful aircraft. Check out the Experimental Aircraft Association.