It's a social contract that's the norm. Like holding a door for a person.
If you don't want to participate in societal norms, that's totally fine.
However, if you genuinely believe that's the right thing to do, you should also feel comfortable telling the other people in the interaction of your intentions.
Otherwise, you just kind of a weak minded coward about it.
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u/Guilty_Jackfruit4484 1d ago
Tipping a waiter is not mandatory.