The ads (in general) will be redirected to where you will see it, regardless of whether or not Amazon allows bots. You don't think you're getting off that easily, do you?
It's also trivial for Amazon competitors to pop up in this potential AI future. Maybe you only sell door knobs, but all you need to do is set up a mostly text-based API designed for AI consumption and you're in business. If you offer the door knob for 10 cents less, why wouldn't the AI agents buy from you?
Right now making an Amazon competitor will fail mainly because humans are lazy and can't be bother to check other sites. AI might change that.
Agreed. But that's where Amazon needs some thrashing from users, competitors and regulators to start with.