When the satellites start talking to each other by laser in a vacuum then every trading house in the world will be sending orders by it as it will be quicker than fibre.
you are argumentative. Watch the starlink videos on YouTube. People are ecstatic that they have got fast low latency internet in the middle of nowhere.
You have jumped to conclusions not based on any fact. IB offer portfolio margin if you apply and have cash or assets over $100,000. There is no information or evidence that anyone has been offered more than that or that it is even possible.