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When I see a delivery fee that's a % I assume it's a tip and don't tip myself.

It's the same thing here. It's not my job to be fair to the employees. I'm generally a very fair tipper but if you put a % fee on my bill I consider it my tip. Most of the time it's less than I would have tipped regardless and I'm ok with that.

I also typically won't go back if a restaurant does this because I fundamentally disagree with it for all except large parties of people.