"But once that factual data is put into the public domain, then it should be accessible."
Of course it's "accessible", and as I understand it, some of these parasites have been offered license deals. But publication is not "putting it into the public domain".
Yeah, lets get rid of intellectual property rights generally. Once your patent is published, anyone may use the method for free. Piracy is cool. End the tyranny of the elite!!! CL is just another bourgeois middleman sucking the blood from workers and capitalist alike, right?
I suppose if a service directly/indirectly scraped CL for addresses of units for rent that might not be a copyright violation. At some point the expression of a "fact" is distinct from the fact expressed.