As promised, after solving my disputes with FXCM – and I’m still talking to them – I asked them about the strange norm and got their answer. 4 or 5 weeks later but I got it. I try my best to translate it. They won’t prevent their customers from trading with software or EAs but they should not been held liable for any losses caused by third-party-softwares (that are not developed by FXCM) because of errors in programming (bugs) or similar reasons.