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> After all, they're the ones deciding to offer the option to tip.

I don't have direct experiencing running a retail business outside of hospitality, but I would venture to guess it is the only way to retain staff. After all, if you are the worker, why would you work at the store that refuses to allow tips when you can just as easily go to the store next door that does?

Superficially, it is true that the business owner gets the final say, but they don't get to make the choice in a vacuum. You don't have a business without staff.