Though it also wouldn't be the first company to lure in a bunch of VC money, pay themselves ridiculous salaries for a few years, and retire when the project crashes and the money runs out.
When a company raises venture capital, they have to file a disclosure with the SEC.
So, it appears that money is coming from somewhere else.
That said, how much money do you need if you're not actually building anything? Making a few prototypes is just a fancy science project.
Lightning reportedly has 20-30 employees (17 are listed on LinkedIn, which is consistent).
In Northern California, the salary costs alone are a couple of million $ per year, and they've been doing it for several years now.
It adds up (company was founded in 2005), and someone's paying for it.
Standard banks don't give loans to startups with pretty solid revenue paths.
Investment banks do, but they don't hide their investments. Neither do VCs.
I have looked, and haven't found an investor list for Lightning.