Tipping the scales of justice

Did you hear about Starbucks being ordered to pay current and former employees millions, because supervisors have been taking a cut of what is dropped in the tip jar?
I am not a fan of the chain, nor the idea of tip jars. I am, however, a fan of following the law.
While Starbucks says sharing the tips promotes a team atmosphere, the reality is, (and the law says) that there are different rules and responsibilities for supervisors. Supervisors are not "part of the team", they are team leaders.
Certainly tip jars work. If I worked in a service industry nowadays, perhaps I would feel different.

Tipping when one receives ordinary service only encourages ordinary service.

When you sit down in a restaurant, custom says you tip a percentage of the bill. Why, then, do tip jars generate money based on the amount of change one gets back after the purchase?

If I was the judge in this case, I would have ruled in favor of the Starbucks employees. And since judges also provide a service, I would have put a tip jar on the bench. No doubt the plaintiffs' attorneys would have dropped a couple of quarters.