I got this on the dominos pizza app recently. I clicked the bread sticks by mistake and clocked out, and a pop up came up and offered me the bread sticks for $1.99 as well.
So now whenever I get Dominos I click and back out of everything to get any free coupons
It’s retargeting and it happens much more often than you think.
Try the same thing at pretty much any e-commerce store. Works best if you checkout as a guest (using only your email) and get all the way up to payment.
A day later you’ll typically get a discount coupon and an invitation to finish checking out.