Human flight has been a graveyard of ideas.
Everything that looks promising ends up flat on its face.
I'm generally on the side of the debate that believes there will NEVER be actual useful means of flying for humans.
Totally different endeavors.
We know that there will never be, say, specific forecasts of hurricane landfall locations a year, or even a month ahead of time..that's been proven mathematically.
It's a chaotic system for which there will never be perfect data.
Anyway, anyone actually investing in this company would do as well to pile some cash up and light it on fire.