Actually they use soy sauce when they season thing such as rice, meats, and vegetables. Soy sauce contains MSG. So yes they use it indirectly. MSG is safe though when consumed in moderation.
Yes, but you can ask them not to use soy sauce on your food and will cook yours on a different part of the grill.
No they do not. They cook and season everything in front of you.
Thanks! Your answer is awaiting moderation.