I certainly agree with the underlying idea, and maybe its not an apples to apples comparison, but Openstack would be an example of an open cloud platform that has failed to provide such benefits.

Rackspace has largely abandoned the project after initially opening it up, and public clouds based on Openstack seem to be getting shut down left and right (I could go on a long rant about why that is the case, since I am an Openstack contributor :)