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The height of insanity IMHO.
https://www.cnbc.com/2017/08/07/papa-johns-new-gluten-free-pizza-isnt-for-the-gluten-intolerant.html
I love Gluten in my pizza.
Probably just covering themselves from any lawsuit that may arise
People with Celiac disease and severe gluten intolerance can have severe reactions to even an iota of gluten. And a restaurant really can't guarantee that cross-contamination won't occur. This is a disclaimer that most places that offer gluten-free items make. I am sure it's both to warn people with either condition and for the CYA aspect.