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Plain bread doesn't have sufficient water activity to support bacterial growth.
Focaccia is generally bread with oils/fats (oils aren't water so they don't contribute to water activity).
Sweetened pastries have more water in them, but have most of the water bound to sugar molecules so that there's not enough water activity to support bacterial growth.
But pizza has a water-based sauce on the crust, and often has moist toppings. That's why some pizzas become soggy over time. That's enough water activity to support microbial growth, including some microbes that cause illness. So pizza should be refrigerated.
Thank you for this, it's a great explanation