I don’t know the material, but understand the engines they are using were considered at end of life for use in helicopters before this company took them.
"Manned Hrs" determined by FAA / DOD, if the Turbines weren't over-soaked with heat on start up and ruined or close to it, Starting it up and running as a ground pounder might be a low risk venture if they can keep the turbine temps in line, if they just keep it running, think steady state.
I am not sure of the materials of the blades, and if you think of it, for a casting house this is a HUGE business opportunity.
The casting houses that make these blades could upgrade to "Single Crystal" or like technology for longevity and not have to got through FAA - DOD approval / flight test. Amazing what you can do when certain entities get the heck out of the way...