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Crypto has exactly one non-scam use-case: a way to transfer value that's more resilient to government interference. Can be used for crime, grey areas or in the very rare case where there's no other financial infrastructure to transfer value. Cryptocurrencies make various trade-offs around efficiency, energy use, user experience, etc to operate in such a hostile environment, therefore they should really be used as a l…
And even then, its usefulness in this regard is limited when its valuation is highly volatile. Probably not an issue when the full transaction life cycle can be fully completed (buyer acquires crypto, buyer and seller trade crypto, seller offloads the crypto) in a matter of hours. But this narrows the use case even further.