Maybe I should rephrase that: to imply that there is no clear-cut demarcation between transactional and reciprocal relationships is offensive. That demarcation might not be visible to an internet platform, but it is obvious and unambiguous to the individual participants.
No. It's obvious and unambiguous from the inside. It's not necessarily so from the outside. We deal with these kinds of things in the courts, all the time, but that's an obviously untenable proposition for Craigslist.