California-based workers for food delivery app Grubhub have reacted angrily to changes to the platform which they say discourage tipping, saying they would wipe out the supposed benefits of new gig worker rules in the state.

Last month, California passed Proposition 22, which though falling far short of the benefits received by full-time employees, gave gig workers a limited number.

Weeks after the ruling, Grubhub reduced its default tip amount from about 20 percent to zero, adding a suggestion to “leave an optional tip on top of driver benefits.”