I assume things like that get easily resolved with international treaties as other countries get retaliatory measures. Eg if Canada set up mandatory cloning of

I assume things like that get easily resolved with international treaties as other countries get retaliatory measures. Eg if Canada set up mandatory cloning of US citizen phones at the border when they try to enter, the tables would turn, so people would start complaining. This is how visa waiver programs came to be, how tax agreements get created etc.