Are certain fast food companies allowed to wear acrylic nails or is it only franchised places? Or does it depend on the owner?

I don't wear fake nails anymore and when I get hired at food service places I just assume that they don't allow it

But I was at chick fil a today and the cashier had green acrylic nails in downtown

And when I went to the hospital cafe in the summer the team member had acrylic nails
Are certain fast food companies allowed to wear acrylic nails or is it only franchised places? Or does it depend on the owner?
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