Tipping is an essential part of service workers' compensation and a longstanding social norm in the US. However, recently, Americans have not been tipping as well as they had previously been during the pandemic. This decline in tipping enthusiasm may be a result of inflationary pressures that have imposed financial strains on many Americans. As a result, though, service workers have been struggling financially, and this has caused gig workers in particular to begin to push for wage guarantees.
See "As Americans become stingier with their tipping habits, service workers' compensations take a hit", Wilfred Chan, The Guardian, December 6, 2022