I just checked the labels on our most-often-used sauces: nary a hint of MSG except on the Maggi, which only exists to add MSG to stuff. Trouble is, it's got lots of other stuff and I don't want my ginger prawns to taste like a Swiss salad.
They don't need to add MSG, most savoury/umami sauces are effectively loaded with it anyway...
'Chinese Restaurant Syndrome' was A Thing in the past. Its existence has been debated by some...