The answer to your question is a very simple one.
Very few passengers opt to remove the auto tips.
The list of names / cabins removing the tips on a 7-day cruise can be as few as 10.
The Purser's Desk will normally ask why you want to remove the tips; if service quality is involved, we want to know about it as soon as possible.
This list is published every day to all ship hotel department heads.
They review the list and inform their staff who and why the tips were removed.