They can but it is meaningless, those jobs are hired and fired based on work, and that tip sharing was to cut down on resentment, it was not always so common, I still remember seeing it as a fairly new idea in most restaurants.
If “fairly new” = for at least a quarter of a century then I suppose you’re right. Of course in the end I don’t understand why people whine so much about tipping. I enjoy it, I like having them also work for me, and I like giving them an “adaboy”.