The problem is it is so ingrained in US culture that switching to tip-free has generally failed where tried, even in pro-labor lefty hoods in blue cities.

Numerous restaurants in NYC tried and flipped back over the last 10 years. Restauranteurs reported illogical / innumerate behavior where sales went down when they switched to untipped higher prices.

https://www.eater.com/21398973/restaurant-no-tipping-movemen...

The only restaurants that it stuck were Japanese restaurants that cater primarily to Japanese ex-pats, because culturally its familiar to them.

Well sure, it has to be mandated through law or underpaying workers will inevitably outcompete those that pay workers. I don't think that's an argument that anyone likes tipping culture (except wait staff in bougie cities).