The most innovation is happening in financial products. There's no way for a developer or entrepreneur to experiment building in traditional finance without the support from large financial institutions. But in DeFi, there are financial applications built by teams in India, Africa, SE Asia, etc.
If you want an example of one innovation, look at flash loans. Flash loans provide the ability to atomicly borrow infinite money for the duration of a transaction, with no collateral or credit. This money can be used for arbitraging or just to provide working capital for a complex operation. If the loan isn't repaid by the end of the transaction, the whole transaction is cancelled.
Better explanation: