During my Ekoparty presentation about prompt injections, I talked about Orderbot Item-On-Sale Injection: https://youtu.be/ADHAokjniE4?t=927
We will see these kind of attacks in real world applications more often going forward - and I'm sure some ambitious company will have a bot complete orders at one point.
I think the first step will be replacing frontends with these bots, so most of the business logic should still apply and this won't be a valid attack vector. Horrible UX tho, as the transaction will fail.