Instacart, the same-day grocery delivery company used by many grocers, is dealing with customer ire as freelance shoppers fulfilling the orders are passing up some jobs due to a change in the pricing structures. Also a number of shoppers have taken to Twitter to call for a boycott of the service due to a drop in their wages.

Given all the attention paid to buy online pickup in store including its popularity with shoppers, only 28% of U.S. retailers currently offer the service, compared to 64% of British retailers providing its cousin, click and collect, according to a report from OrderDynamics. Retailers here were also found lagging in other categories.