Caffeine has anti-fungal properties, which may be why coffee plants produce it, and decaffeinated coffee has more mold and mycotoxins.

“caffeine does have anti-fungal properties that's probably one of the reasons potentially one of the reasons that coffee plants produce caffeine as you'll see in the next section there is more mold that grows on decaffeinated coffee there are more mycotoxins into caffeinated coffee beans”