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"May I ask what you mean when you say "until the market develops"?"Without speaking for OP, naturally:
One of the biggest issues with web businesses is public acceptance of the new business model: think Netflix, Spotify, or even AirBnb, all are dramatically different ways of doing things that require a non-trivial amount of social change to gain traction. Changing society and the way people perceive/do things is really hard.
Doubly so if there are licensing issues in the way - a la Spotify or Netflix.
In other words, if you're going to have to go all-in and expend an enormous effort for adoption, you don't want to do it in Canada. It's easier for these services to proliferate first in other countries before importing it to Canada where consumers are already chomping at the bit.
See: Pandora, Spotify, Netflix, all of which built up enormous pent-up demand before they even showed up at Canada's doorstep.
> "I'd hope that any company not offering their services to Canadians would have a pretty good explanation as to why they aren't taking advantage of that market."
There's one very good, almost universal reason: Canadians don't spend as much. In fact, per capita, they can spend half of what the average American consumer spends.
The reasons are numerous and not at all negative - lack of access to stupid credit, general cultural aversion to debt-building, lower credit card usage amongst the entire population, high taxation resulting in comparatively low disposal income. These are all things Canadians in general take pride in, but it also makes the market less interesting to businesses.