This is actually an interesting point - Shaw's VOIP service similarly doesn't count towards cap. As mentioned in the update to the ArsTechnica article, the movie service not counting is apparently because it is delivered via different infrastructure -

"Shaw's existing video-on-demand QAM cable infrastructure. When users access Movie Club through a computer, they will access an IP-based version of it delivered over the Internet—and this will affect monthly data caps."

but surely the VOIP phone data is delievered over the internet...