This may be a targeted offer. Check your email and/or the app. Popped up for me immediately upon opening ibotta. quickly googled this link for details:
Between 07/25/19 9AM MT – 07/31/2019 10PM MT, use Pay with Ibotta at Chipotle for a meal up to $10 and receive 100% cash back on your purchase.
Limited to one use per customer.
Limited quantities available; Ibotta may, in its sole discretion, remove this Offer from the app at any time, with or without notice to You.
You may only use Pay with Ibotta and the 100% cash back offer for Chipotle purchases between $5 and $10.
Your debit or credit card will be charged for your purchase at Chipotle, and cash back will be instantly credited to your Ibotta account for 100% of your Pay with Ibotta transaction at Chipotle, up to $10.
Once you've earned $20 in your Ibotta account, you can withdraw your earnings to Paypal, Venmo, or a gift card.