I think the objection is that the initial knee-jerk reaction to try to fend off scrapers/competitors had a (potentially unintended) consequence of being pretty anti-user by claiming exclusive ownership over the user's content. Craigslist doesn't have to play nice with other services, or aid their competitors, but trying to fight competitors by overreaching and harming your customers isn't OK, which of course, is why they then backtracked on that bad policy after enough public anger.