At the grocery store I only see "MSG Free" labels on soy sauce, ramen, noodles, etc. but nothing for chips, burritos, burgers, etc.
I know there are people who dislike MSG, but the MSG scare was also racist scaremongering, and I wonder how many people think they dislike MSG because the media said Chinese food will kill them while gulping down a big mac and bag of doritos every day
I also thought this before I got diagnosed with celiac. But there are a LOT of foods that are regularly contaminated with gluten in the manufacturing process. I have to call to check that things aren't made on shared manufacturing lines regularly. When a product says "gluten free" that gives a bare minimum legal level of responsibility to avoid contamination.