If CraigsList ever went after a poster who also posted their classified on another site, that would probably be the day they begin to unravel.
You don't want to instill fear into posters (IE, their product) that they could get sued by posting even a similar ad on a competing site. Then you enter the territory "I only have access to people who check craigslist" instead of an array of additional, complementary options. That doesn't sound very attractive.
Right, I don't think they would ever sue their own users. But the point is that you don't get to simply ignore parts of an agreement that you don't agree with, because "that's not what they meant". So the people who were saying that PadMapper has no right to use Craigslist's data should be careful not to submit to multiple listing services if they ever put a house up for rent on Craigslist, if they care at all about consistent application of their principles.
Padmapper scraping data put up on CraigsList and adding it to their own listings is very very different than me putting my own listing on multiple sites.
I don't see this as a "application of principles" issue. The principle I'm consistently applying is "I have the right to tell whomever I want about something I want to sell." And Craigslist is applying the consistent principle that the listing I provided belongs to them. If you ask me, putting my listing somewhere else makes it a different listing, because it didn't originate at craigslist (Like stolen listings on PadMapper), but instead, originated through me.
To apply my principle consistently, I wouldn't post a link to my Craigslist posting on another site, but I am perfectly entitled to re-post its content where-ever I please.
The new agreement says that by posting on Craigslist, you give them an exclusive license to the content. You can't give them an exclusive license and then turn around and give the content to someone else.
You don't want to instill fear into posters (IE, their product) that they could get sued by posting even a similar ad on a competing site. Then you enter the territory "I only have access to people who check craigslist" instead of an array of additional, complementary options. That doesn't sound very attractive.