I guess it would be a really really big blank check, and then you'd still have to get from a PoC to a commercially viable plant and convince the public it's not

I guess it would be a really really big blank check, and then you'd still have to get from a PoC to a commercially viable plant and convince the public it's not a hydrogen bomb and it's quite safe and then you'd have to outcompete renewables for decades to get a decent return while you miniaturize your device for use anywhere else than a stationary plant, and then someone starts making a paint with tiny organic solar cells in it and absurdly-efficient batteries and while you can still make a killing for niche applications, it's a pittance compared to your investment. I guess in the end both risks and upfront costs are just way too high to do things that way.