Most landlords probably never even realize the traffic first got to CL through Padmapper at all. Whenever I'm asked, I automatically just say CL. Bringing up Padmapper is just likely to confuse.
CL is deliberately making its service less useful both to its paying customers and the public at large. And the sole justification for this is fear that Padmapper could grow to be a bigger, better competitor someday in the distant future.
Leveraging a monopoly to destroy technological progress for fear of future competition is irksome.
It's almost certainly not illegal, and maybe not even morally wrong. But it still sucks.
Yet for all that, I'm moving on July 15th, and I think there's about a 95% chance I'll find the place through CL. That's where the market is.