Don't conflate all employers with some. Many major chains do this, but most mom + pop sized restaurants have razor thin margins ... maybe a happy medium would be based on revenue/profit, like if your restaurant is making over 100k/year, all of your staff need to be paid at least minimum wage.

But really, the countries that accept tips also have an atrocious non-livable minimum wage that doesn't match the inflation from their endless money printing / central bank relationship, but that's for another day :D