[taming]

I have only looked at the Kobo Terms of Use, but I would not be surprised if other companies are similar. In the section titles "Registered Users" it states:

(a) provide true, accurate, current and complete information about yourself as prompted by any registration form(s) on the Service, including your geographical location and billing address (the "Registration Data"); and

(b) maintain and promptly update the Registration Data to keep it true, accurate, current and complete. If you provide any information that is untrue, inaccurate, not current or incomplete, Kobo has the right to suspend or terminate your account and refuse any and all current or future use of the Service (or any portion thereof);

I see this as Kobo doing its version of due diligence to assure the publishers, authors, and agents that have skin in the game that they are prepared to enforce things like geographic restrictions should violations of the agreement come to light. So, for example, if I choose to enter a non-Canadian address in my account information, thus giving me (for example) access to non-agency pricing (use of discount coupons now apply) in the US for Penguin and Random House titles, I do it at the risk of losing my ability to buy from Kobo in the future. I might lose access to downloading additional copies of my past purchases, as well.