Huge advantages for both. For example, something that's only possible on a blockchain is a flashloan. This is where you can get a loan for any amount (liquidity provided) as long as you repay the full loan amount in the same block. This primitive alone allows for much higher velocities of money since value can be moved and repayed in a single block (on the order of 10 seconds).
All of the advantages of defi boil down to increases in velocity of money. For example you can deposit funds into a contract and receive a token that represents your liquidity position. You can then use this token in other applications. So now you have this composability of money which allows people to create new financial primitives.
It's actually way funnier than GOP presets to be. Flashloan must be paid back in the same transaction. Since whole thing happens in the same tx, it's atomic. So you can use smart-contract logic to determine if you are actually making a profit, and if you are not - revert!
A couple of things. First these are companies that are building up. They are not fully instituted. Second they have many partners that are helping them build out. As far as customers, yes both THETA and VET have customers....including some .gov customers.
All of the advantages of defi boil down to increases in velocity of money. For example you can deposit funds into a contract and receive a token that represents your liquidity position. You can then use this token in other applications. So now you have this composability of money which allows people to create new financial primitives.