Earlier quoted context omitted.
Someone clicking an ad is not a) making an order or b) pretending to be someone else, which seem kinda instrumental for the fraud in your analogy. The ad didn't get served with a ToS document explaining that by clicking it, you enter into a contract or whatever. It's your decision to pay money based on ad clicks, and it doesn't somehow oblige people who have nothing to do with you to only click ads in the manner you…
Alright, how about an example with no orders? Let's say you think the police state is evil, and you wish to destroy it by wasting its resources. Is making automated empty 911 calls justified? Just because you intend to use the 911 hotline as an emergency resource surely shouldn't impede my right as a phone owner from calling it in the manner you intended. It's my god-given right as a phonebook owner to call whatever…
This is more the equivalent of replying to every piece of physical junk mail that you get using their provided self-stamped return envelopes. I think you'd be hard to pressed to argue that, while being a jerk move, you're still aren't entitled to do it.