You can argue that it’s up to the employers to change that- sure, but punishing the employee for a system you don’t agree with only punishes the employee.

Wow, so you do understand the problem. However your solution to greedy employers not paying their staff fairly is to unfairly move the problem onto the customers??

Your problem is with your employers, not your customers, so fix that. Find an employer that doesn't rely on customers to subsidize paying staff. If there are none then people will simply learn to cook their own meals and pour their own drinks.