A tip is supposed to be something you give a person for good service, not something that we should have to do- and certainly not something we should do before the service even happens!! The system is broken, and we need to call it what it is a fee or a vig. I'd like to see a sign in every restaurant next to the health dept one. Same idea too, just a big letter grade, that goes like this:
A: All workers are paid a living wage based on the area, and any tips are welcome but not necessary
B: Workers are all paid at least full minimum wage, and probably need tips.
C: Workers are paid the tipped minimum wage, and only make enough money if they are subsidized by you, our patrons. We have decided to let our customers decide if our staff deserve to make rent this week.
D: Not only do we only pay the minimum, but we use your tips to make up the difference- so your tip may not even be enough to get our workers home tonight.
F: This company has a documented history of stealing tips, tip sharing to subsidize other staff members, or general wage theft shenanigans. Please don't expect your tips to make it to the people you intended to tip.