How real does it need to get? Bitcoin is an official currency in Venezuela, which might be considered as pretty real...
I'm obviously not trying to discredit Bitcoin, I'm saying that the EULA will likely cater to the fact that Bitcoin isn't legal tender in most countries, including the one that which the company exists. So, while Bitcoin most definitely is a real currency, its not registered globally as that by, at least technically. Hence the suggestion of creating a virtual based currency for the server, rather than integrating via Lightening directly.