The problem in reality would be non existent if people used crypto currencies for what they were meant to be used for: an alternative economy with no need for exchanges and third parties: you sell me a banana, I give you some satoshis.
Not saying this is convenient IRL, requiring to sync to a network and chain is expensive and difficult from a phone, but that was the supposed use case.
I'm more and more convinced that blockchain industry solves no real world problems at all, except in the crypto sphere itself (like smart contracts do have a use...for crypto exchanges, crypto games and crypto gambling) and that 99% of the people who get involved couldn't care less about crypto use cases, only if they will sell for more $ than they bought for.