There are eateries that 'pool' tips, and they're split with the waitstaff and cooks. Why the cooks I don't know as they make more money than the waitstaff.
I've even seen some places where the owner takes the tips keeps a part of them, then splits them among the workers. And I've seen him punched in the mouth for doing that, by a customer after he found out what was going on.
True story, but it happened back in the 80s where my ex worked.