Currency exchange. P2P Lending. Money services.

But the problem is that it's not real currency and you can't do anything useful with it beyond trying to trade it to a bigger idiot.

Some people want USDC, some people want non fungible assets, some people want ETH, some people want an ERC20 that backs an idea or organization. DeFi let’s these users manage these assets without placing them in the hands of a single actor.

Saying nobody wants ETH or USDC is like saying nobody wants AMZN or AAPL shares. What you really mean is that you are not interested in those assets.

Those are not "assets" in any meaningful sense. You're just making things up.

ETH or USDC are as much “assets” as stocks, gold, bonds, property, domain names. Humans and social consensus made all of this up.