Did they explicitly tell you that's why the order was cancelled? I've placed many personal orders with them and never had issues.
Hi xxxx,
We only ship to large businesses and schools in Canada. We can't accept your order. I'm sorry for the inconvenience. You might want to try Fastenal or Motion Canada.
Lauren
If that's a problem to them, I'm guessing they don't have a fully automated solution to that like e.g. DigiKey does.