at one of these kinds of places? Is it split by all the hourly employees? There's no guarantee it doesn't go straight to the owner. There was a local restaurant owner in my town that took all tips from his waitstaff for himself. He paid younger kids the standard minimum wage (not server wages) to wait tables and pocketed all the tip money for himself. Thankfully, he's no longer in business.
But the tipping at a walk up payment screen just just angering in and of itself. Tip for what?