Isn't the issue that you can do that, but Company A can also add in a clause that you can only do business with us (or with this specific product/website/etc. w

Isn't the issue that you can do that, but Company A can also add in a clause that you can only do business with us (or with this specific product/website/etc. we offer) if you agree to be buying the tickets for yourself and not for someone else. In which case, if Company B says they are, they are lying. I think one interesting question from this is what happens when you put an AI in there instead. If Company B sells an AI that Person can use to interact with Company A, at what point does it count as Person's interaction and at what point does it count as Company A's interaction. Obviously Person is allowed to use technology to interact on behalf of them. They are using Chrome, or IE, or Firefox, etc. This doesn't count as Google/Microsoft/Mozilla interacting with Company A. So on a continuum (likely multi dimensional) from internet browsers to what Booking.com did in this case, including AI somewhere in the continuum space, where is the legal limit?