There's also "legal" wash trading, e.g. the same institution/person putting in large BTC spot buy orders and then shorting the BTC future. This is how companies

There's also "legal" wash trading, e.g. the same institution/person putting in large BTC spot buy orders and then shorting the BTC future. This is how companies like crypto.com, celsius, blockfi, etc are now able to give investors 8%+ on their USDC because the investors need the cash for expensive futures contracts. The companies loan the cash out to hedge funds at high interest rates, take a cut, and give the rest to you.