Um they allow it...What makes you think you can simply find a loophole like that?
There is no Canadian broker out there that allows US residents due to PDF laws. Otherwise, an American broker could just open an office at Canada and get a ton of US
customers under PDF rule.
Jeeze! Use google...
https://www.google.com/search?q=questrade+us+resident&sxsrf=AOaemvLFSEXjOinspfgcgv4EIOTTGhje5w:1640294947571&ei=I-rEYbCrIo2StAaV7KigAw&oq=questrade+us+res&gs_lcp=Cgdnd3Mtd2l6EAEYADIFCAAQgAQyBggAEBYQHjoHCAAQRxCwAzoNCC4QxwEQ0QMQsAMQQzoHCAAQsAMQQzoFCAAQkQJKBQg8EgExSgQIQRgASgQIRhgAUO8JWPh1YPaGAWgBcAJ4AIABjAGIAe8DkgEDNC4xmAEAoAEByAEKwAEB&sclient=gws-wiz
I had an account there before. But because Im an idiot and didnt know what I was doing I lost all of my money... However I was never asked to file a tax return