As the alternative would be precious metals, you could consider crypto as freedom. Sure if satellites and underwater cables where cut off, you'd only be able to transact over a shorter distance, and transactions would take longer.

But even then there may be cases where that's more convenient then physically drive a long distance just to pay in metals. In really bad situations where entire communities are shut off from all connectivity, local cryptocurrencies would likely be an alternative, as your local town or village would still have connectivity through already existing cables or radio signals.