No most (restaurant or premade) soups are not safe, most either have noodles or flour as a thickening agent.There are always restaurants dedicated to all GF foods. Sadly not in my city, but lots in Toronto.
Susan and Dylan are smart. They find the ingredient list online prior to ordering (most times). Usually their questions are only about sauces. Obviously breaded chicken HAS gluten.
I can't imagine any restaurant that serves gluten being cross contamination free.
Also: Employees really need to educate themselves as well. Susan asked Tim Hortons if there were any GF options, and the employee said their wraps were GF. Really? Come on... They were not.
I think soup is pretty safe, as it's not cooked on a surface that has not been washed. But I could be wrong...