Apologies if my comments appeared to be moving the goalposts. I am not trying to talk about morality in a wider sense. If I was, this would be a whole different argument because I believe that corporations are generally unethical as all hell, and consumers are usually within their moral right to exploit them as hard as possible, because that barely even scratches how badly companies exploit their customers or damage wider society. But this is - as you point out - not about that.

The aspect of morality I was interested in from the perspective of defining law is the very restricted aspect of whether the customer is acting in bad faith, knowing that they are getting a too-good-to-be-true deal, or whether they believe the offer made is legitimate.

You ask what makes a human customer service representative so special, in comparison to a bot, and my answer there is simply that they are human

Remember that my argument here, and the deciding factor, is specifically about whether or not the customer believes the price they are being offered is genuine.

Humans agents are special in that regard because they have a huge amount of credibility in reassuring and confirming with the other person that the offer is genuine and not a mistake. They strongly reinforce the belief of an offer being legitimate.

The law itself already (at least in the UK) distinguishes between prices presented (e.g. on a web page or the price on a shelf sticker) and direct agreements made with a person, recognising that mistakes are possible and giving the human ultimate authority.

Really, this entire argument comes down to answering this: Should information given by a chatbot be considered to have the same authority and weight as information given by a person?

My personal argument has been: "Yes, if it reasonably appears to the recipient as genuine, but no if the recipient might have probable cause to suspect it is a mistake, knowing the information was provided by a computer system and that mistakes are possible."

For most people in this thread however, it seems (based on my downvotes) their feeling has been "Yes, it has the same authority always and absolutely"

I can accept that I'm very much outvoted on this one, but I hope you can appreciate my arguments.