Why cryptocurrencies exist

The goal of Satoshi Nakamoto's invention of Bitcoin was to enable two willing parties to transact directly without needing a trusted third party.  

The reason is that modern banks have flaws and disadvantages to the consumer. Due to their centralized nature, they can be unreliable, vulnerable to security threats, charging fees and even biased. This is why cryptocurrencies will pave the way for a better banking and payments experience in the future.