Stock index futures can only be done in the futures companies of brokers, but ordinary futures companies can't, can they?
Yes, but you have to think about it. What are the characteristics of futures companies with brokerage background? Yes, money, strong financial strength, good hardware and fast runway are called deep pockets. Moreover, futures companies with brokerage background are particularly compliant and will not take risks to do some dangerous business. Because they are worried that there will be no customers and tens of billions of stock customers will be there all the time, the futures companies of brokers are also risk-resistant.