[flavius29663]

Servers prefer being tipped rather than getting a higher minimum wage. They can make 20-30 an hour from tips, good location ones even more. https://upserve.com/restaurant-insider/impact-minimum-wage-i...

This is an interesting take: with the idea that maybe the actual customers can contribute to the worker's salary

The customer always contributes to worker's salary

[loeg]

Some portion of servers also prefer cash tips because it enables illegal tax evasion, which increases their effective take-home income.