The krrb tool extracts data from a file not on craigslist servers, but from the browser cache on your own computer. It's a browser plug-in, not a server-side tool. If CL is okay with you downloading a copy so that you can see the post that you just made (which they obviously are by virtue of how their service works) then in fact there is no additional bandwidth being consumed!
It is just that, with a copy-paste job, it would be impossible to detect this, which is why they seem functionally equivalent. But actually they're not.
Also automation and convenience have huge legal implications. I can, for example buy an iPod in the US and gift it to a friend of mine in Turkey. We have effectively circumvented state tax. I can't, however, write a website that acts as a broker between US passengers landing in Istanbul airport, and people who want cheap iPods. Even though they would be technically paired up with a "friend" and would be within their legal rights to bring valuable goods into the country.
I can have a friend stay a few days at my house, but I can't turn my house into a hotel with Airbnb. Volume and convenience affect the bottom line for different parties.
I'd agree, but this is precisely what Craigslist is disputing in their C&D. Reread the letter.
CL seems to have a stone age version of automatic. A cave man would think a cigarette lighter automatically creates fire, but it just technology that's improved.
Instead of rubbing sticks together for a half hour we can make fire with flick of our thumb. We still had to do something.
Higher productivity != automation and shouldn't be used as an arbitrary measure of legality.