Reducing income inequality was never the goal of Bitcoin.
Crypto is about empowering the individual at the end of the day, vastly different from today’s economic world controlled almost exclusively by large financial corporations, central banks and governments. Sure, banks and governments still will have a role to play in the crypto-economy, but it would be either greatly diminished or the nature of services would be different to those that exist today.
Eventually, the goal and hope is that individuals will influence the economic system in a far bigger way, both individually and collectively, than is possible in today’s centralised ‘big-institution’ environment. Individuals will also have more avenues to act as a mini-banks themselves to borrow or lend their crypto-assets, because they no longer need a bank to be able to do this. All these scenarios are technically possible today, just that most major governments aren’t making it easy for society to move to crypto-economy economy.
And finally, there are a lot of brilliant minds at work in the crypto industry. It would be a gross disservice to say they don’t understand credits, debits, debts, loans and interest. That’s a lot of handwaving and stroking with a broad brush to make a point, and is not being fair to the intellect & sacrifice of the open source technology community.