Annual bonus is either performance based or as a retainer to make up for differences in the wages since the person was hired.
Stock options are because you could be paid more or you are taking risks for future rewards.
A mandatory tip is because your employer doesn't want to pay you full wage and instead of increasing the price and pay you more, they pass it over to the customers. So they get the same profits without having to bother.
A mandatory fixed/clearly defined tip is effectively a service tax. Nothing wrong about that if it’s clearly advertised (e.g. you don’t have to pay it if you take out). Quite a few countries in Europe have stuff like that.
Variable, pseudo-optional tips seem like a much bigger problem.
Employees are paid for the work they are expected to perform during the hours they are at the office. The company doesn’t expect them to do more than that, however if they do, they get a nice bonus for it.
Baristas are paid to make iced tea. The customer doesn’t expect them to do more than that, but they can be nice, learn your name, prepare your tea ahead of time, change the tea recipe to something you enjoy more. Don’t you think they should get a nice bonus too?
Stock options are because you could be paid more or you are taking risks for future rewards.
A mandatory tip is because your employer doesn't want to pay you full wage and instead of increasing the price and pay you more, they pass it over to the customers. So they get the same profits without having to bother.
Quite different reasons.