[mountainofdeath]

That's only true in the case where the underlying cyptocurrency is actually accepted outside the platform. In theory, if your app is transacting money, it keeps the equivalent cash in an insured bank account which is exactly how PayPal and similar work. If it's not widely accepted, it's basically the same as in-game tokens/currency. Speaking of in-game tokens, people have used them for the same purpose of cryptocurrency e.g. capital flight and money laundering.