Instacart shoppers have just begun a three-day protest concerning the firm’s tipping policy. Workers would like the firm to raise the default tip from 5% to 10%, as it was in 2016. Additionally, workers would like the “service fee” removed because it confuses customers. Instacart has been under fire a lot in recent months over pay and labor issues. This year alone, there have been three additional shopper walk-offs.
See "Instacart gig workers begin 3-day protest over tipping policy", Jessica Dumont, Grocery Dive, November 5, 2019