At minimum, a legitimate broker should refund the deposits made by a client. If the client and/or IB obtained profits through tactics the broker can prove were in violation of their terms and conditions then the broker can refuse to pay those profits. However any profits made that don't violate the terms and conditions belong to the investor. That being said, Just Forex at minimum needs to 1) Refund all deposits made by investors 2) Pay profits that were obtained following the terms and conditions 3) Provide investors proof of when trades were obtained in violation of terms and can refuse to pay those profits.I've contacted their support and they told me that it's illegal with them. Could you share the proof that you can use arbitrage with this brokers?
Looks like you haven't familiarized with T&C and involved other people in your tricky strategy.