From the perspective of most technical people in crypto, FTX was traditional finance. Traditional finance doesn’t run on-chain, and you have to trust the people running it. See FTX and Coinbase for an example.
In opposition to traditional finance is decentralized finance. Decentralized finance is implemented via smart contracts and cannot steal your money. See uniswap for an example.
There’s a gray area in the middle with things like Tether, USDC, and rollups like zkSync where the creators have a privileged key that allows them to steal all the money deposited into it.