In the past, they used to require Shoppers to put themselves on a schedule to be allowed to Shop. The times varied by day, for example from 9am to 12pm, or 12pm to 3pm, but once a shopper was on the schedule, they would get sent batches to their phones. It determined their availability. And since Shoppers are independent contractors, they have freedom of choosing whatever Shop suits them best. It’s up to the shopper to either accept or decline the batch(es) - whether it’s because it’s a low paying order with no tip or a great one.
In 2019, they introduced a feature known as On-Demand. The premise of On-Demand was that they were doing away with the schedule and doing a free-for-all. Batches would now be available on the app for any Shopper to shop. No schedule, just orders sitting on the app for any Shopper(s) to take. This was entirely dependent on demand. If there were no orders being placed on the Instacart platform, then there are no orders for Shoppers to fulfill.
Fast forward to June 14, 2021, Instacart sent Shoppers this email below: