In Seattle, there was a push a few years ago to eliminate tipping in many restaurants. A 20% service charge was automatically added to the bill instead, on the theory that it would result in fairer and higher compensation for restaurant workers. Several of the places I frequent made this change at around the same time. Only a few years later, most restaurants seem to have reverted to the old policy of tipping.

I've been told by several waiters and bartenders that worked in these restaurants that there was an employee revolt. People earned noticeably less money under the mandatory 20% service charge than with tipping. Consequently, no one wanted to work for restaurants that didn't have tipping. It was seen as a socially conscious move but it backfired for the people it was supposed to help.

The behavioral and economic dynamics with tipping in the US seem to be more complex than people account for.