It's a little more nuanced. Yes Bell and Rogers have a duopoly but they are also required to sell network access at a regulated wholesale rate to other ISPs (Teksavvy, start.ca, etc as Ontario examples). It's kind of a weird setup, but you can read more about it here. https://www.google.com/search?q=The+CRTC+requires+telephone+....

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The CRTC requires telephone and cable companies to sell access to their networks to independent Internet service providers (ISPs) at regulated wholesale prices.