I understand this logic, but where many Canadians have some trouble to follow IB in explanation is for: Why the Canadians as non-US customer on a non-US market as the TSE with no PDT in Canada, we suddenly see the application of this weird PDT on the TSE while you are able to drop PDT on other non-US market? It is because IB use a shortcut in the Canadian status for the clearing house and process the Canadian as US citizen for the trading?
I am not exactly sure of the exact reasons as I haven't been involved in the discussions with the SEC. However, we have to impose PDT on anyone trading Canadian markets. We are trying to work out a solution. Will let you know if I find out any further information.