This morning I saw an Ibotta ad on DuoLingo. Odd place for an ad of that type.
Twice I have seen Ibotta mentioned in the news during segments about ways to save on groceries, etc. Checkout51 was also mentioned in one of those segments.
I have also seen a tag about Ibotta on Glad food storage products at Walmart.
Any ads in apps are probably, but not necessarily, populating from your phone activity. I see FAO ibotta ads on a music streaming app I use occasionally.
It is always for something I have redeemed, but gets me to look anyway.