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.
is it your belief that all relationships can be cleanly categorized this way?
AKA, I can't define it but I know it when I see it.
I have nothing to add other than to say that's completely, unambiguously true about 95% of the time.
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.