> people seeing orders and buying based on those orders before the original orders go through This literally cannot happen unless someone is breaking a law. An

> people seeing orders and buying based on those orders before the original orders go through This literally cannot happen unless someone is breaking a law. An order is not visible until after it has executed. What can happen is some actor want to get a better price for their order and thus split up the order into multiple orders that it tries to execute simultaneously. Then someone can act on one of those that process quicker before a second of those split up orders end up executed. And that is fine - propagating changes of price quickly between multiple separate market places is a good thing as it lowers the transaction overhead in general.