There can never be one thread about new service to Montreal without you having to repeat yourself over and over again. So what Tunis isn't a major business capital? Be happy YUL is still attractive enough for airlines to want to start service here, no matter where they're from or what service they offer.
Montreal may need flights to places like Tokyo, Sao Paolo and Madrid, but until that happens, be grateful for what you have. Haven't you ever been told; if you don't have something nice to say don't say anything at all?