You can have good cheat and bad cheat days. You can eat whatever you want, just not wayyyy overboard IMO. Strange enough, I never crave pizza or fries, more sweet things like cheerios,muffins, ice cream and coca cola. Eat your pizza but not a family size one. All it takes is a few mins of eating pleasure to ruin your hard work. At the start of my cheat day, I used to do a HIIT cardio session just to ensure that there was no major overspill of excess calories. Mind you, if you're on a prety low carb cutting like keto, then a cheat day is worth it, but should consist of mainly good carbs. At the start of the day, nothing wrong having a bit of simple carbs but make it one meal.

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