In a sense you are right, but practically speaking individuals can't morally unilaterally defect from tipping. When nearly everyone agrees that 15% is the tip f

In a sense you are right, but practically speaking individuals can't morally unilaterally defect from tipping. When nearly everyone agrees that 15% is the tip for normal performance, and one person leaves 0% for normal performance, that one person is free-riding and effectively hurting an innocent victim. One practical solution would be to close the minimum wage loophole for tipped employees. The difference between the two minima is the presumptive value of the normal tip, so this is a means by which you can coordinate an instant and universal change from relying on tips to having no reliance on tips. It's not exactly ideal, given that everyone knows waiters typically make a lot more in tips and evaded tax than that difference, but it is at least consistent and nominally fair. I am not sure what other practical solutions you might have in mind.