Hello friend! And what is the second pair for arbitration?
The weak spot in this scheme is... broker. In my experience with arbitrage they pay a couple of times, then terminate services. If they see that leak is huge they fix their feed. In the medium-term its a waste of time, risk-free schemes with retail brokers don't last long and it is sad.
Also where it seen that the account type is real? Demo and real execution speed differ a lot

Edit: it's working like hell , thanks Madeo !! I still continue my test