For any currency to be viable, be it a decentralized cryptocurrency issued by a computer program or a traditional “fiat” currency issued by a government, it must win the trust of the community using it.
The whole point of cryptocurrency is to offer an alternative model for that trust.
Trust is at the core of any system of money.
Cryptocurrency systems imbue trust in an inviolable, decentralized computer program that is, in theory, incapable of defrauding people. None of this, however, gets cryptocurrencies off the hook.
They, too, must win people’s trust if they are to become relevant.