I just found out I got banned from Jet.com. I had 4 accounts where I used one of the 20% promo codes with the latest being one I created this morning. They deactivated sometime today apparently and a call to customer service confirmed this. My order from this morning is still in process, so I'll see if it ships.
I did have a strategy to avoid this, but it obviously did not work. I previously deleted the credit card and address from each of the used accounts after the order shipped to keep the accounts from being flagged as duplicates. They must retain the shipping and/or billing info elsewhere and search off of it.
I thought it might be helpful for others to see how many accounts others had and what the circumstances were to help non-banned users stay that way.
Accounts: 5 banned accounts. 1 of these is an account created since ban (new email address) which was banned the next day after order was shipped.
Same Name: Yes
Same Address: Yes
Same Credit Card: Yes on banned ones. Used a separate one for the 5th account.
Used Coupons: Yes