Hi Bruce,
Yes the prop firm robots can be used in the US. Here is the problem with using prop firm robots. They were created using BlackBull historical data. So when you use them with other brokers the results will be different from what is shown in the app. Such as, the top performing robots in the app may not be the top performing robots with a different broker. The solution I have found, if you do not have EA Studio, is to collect all the prop firm robots and put them in a demo account for at least one month. Also each week of so, new robots are added to the app. Take these robots and add them to your demo account. Keep doing this each week. After about a month you will start to see which of the prop firm robots work best with your broker. Now you can select the best performing robots to add to a live account or copy trade to a prop firm.
Alan,