Anything Cox, CDK, or Cars.com related is a complete waste of dealers time and money. Regardless of their spin, those companies are in it for themselves. They care enough and satisfy a paying account enough to make it happy.
For a part it's a dealers fault but I blame these high dollar companies for over selling their company. I really wish dealers would would grow a sack a ditch AutoTrader and Cox including ddc.
I think that's a bit harsh, but I understand your point.
I don't think the rationale of "in it for themselves" is a great argument when there's many other reasons these companies are less than ideal - I think every company is in it for themselves to a degree. The ReyRey and CDKs of the world are probably scared of everything that could come in (ie: DealerSocket making a DMS, Silicon valley entering their space, etc) and they're being incredibly rigid and difficult.