I used this service once during Hurricane Irma at Publix. All items were out of stock so I cancelled the order ($25.00). I look at my card later and they charged my credit card anyway.
Two weeks later I see a charge for $149.00 on the same card from Instacart San Francisco and I have not used that service, only one time.
Either they are thieves or they have a horrible security set up. Someone charged my card for groceries and they just let it go through.
DO NOT USE THIS SERVICE> Once they get a hold of your CC # you are in trouble