Unfortunately, this isn’t true anymore. At least in PA.
34 Pa. Code 231.114. Service charges.
§ 231.114 b
The notice required by subsection (a) must state that the administrative charge is for administration of the banquet, special function or package deal and does not include a tip to be distributed to the employees who provided service to the guests.
If I have 100 acres of land and cut down 66 acres last year, this year my maximum output is 50% of last year’s output but 100% is still going to be gone.