I use real debrid myself. Personally i've not had any problem. I use IDM to download from it, and the majority of the time everything is fine. Sometimes i get the "error" problem, i guess because i used up all the rapidshare traffic n stuff like that. I think its fine tbh. I mean it does exactly what it says on the tin.
In regards to the threat of legal action, opinions are not illegal, especially when justified with an account of how they came to that conclusion. It could also be said that real-debrid are breaking laws, since they have violated the terms of agreement for each file host they have support for.
However: we all know what we are doing, this is an understanding of a "gray area", and had I gone through the same problems as the original poster of this thread, I would have come to the same conclusion, as would many others.
I have also tried to contact real-debrid in the past and not recieved a reply. I would therefore take this thread with a pinch of salt, and serve to encourage you to provide better customer support. The best form of advertisement is, as we all know, a happy customer.