I'm not sure why you can't access https://therokuchannel.roku.com in Canada, but keep in mind that Roku isn't a service. A lot of people seem to be confused about what Roku is and isn't and just accessing The Roku Channel via the website will tell you very little about what you can and can't do with an actual Roku device. On a Roku device, The Roku Channel is one of thousands of channels (apps) almost all of which are not developed by Roku and Roku has no control over their content or presentation. All a Roku device is is a little computer that runs apps - that's it. There isn't any service involved. It's not significantly different than running apps on your phone or computer. There are premium channels within The Roku Channel that are subscription based and paid through Roku, but most if not all can be subscribed to directly through the provider and accessed through a stand-alone channel/app.
If your only reason for accessing The Roku Channel website is to evaluate Roku, I'd honestly give up on that idea if I were you. It really won't tell you anything. You'd be better off getting a device from somewhere with a good return policy. Your experience outside of the US will be very different from a US user's, so you may want to ask around in your area to get more informed opinions.
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