Back in the mid-2000s, I used to study at Starbucks as we had one of their coffee shops on campus.
I would only purchase their spearmint tea, nothing more. It was in a self-serve area, so I knew what I was getting.
Three times I had purchased moldy bagels from different Starbucks. Broke the thing open before taking a bite, and discovered green mold. I promptly returned it for a refund. Three times was the charm, so I never purchased food from them again. I saw other customers blindly taking a bite, chewing, and swallowing their moldy food. Guess they had no taste buds from all the hot coffee they drank there.
Their stores said that it was the bagel warmer that was causing the mold problem. Three different stores!
I have not set foot in a Starbucks since 2008.