Oh man, it would suck so hard if every major corporation like Amazon or whatever started using their own virtual currency...
Like these:
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There's hundreds of those things, and they don't interchange between merchants.
And those are just the ones denominated in dollars. There are "rewards cards", denominated in "points"
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and phone cards, denominated in "minutes".
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Those really are a sort of currency, since they have their own unit.
In the US, stored value cards usually don't interchange between vendors. Hong Kong, though, has the Octopus card.
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Works for transit, vending machines, fast food, etc.
So there are already a lot of corporate currency-like things out there.