Is there something that is fundamental to the cloud that promotes vendor lock-in? I can understand it from operating systems and retailers. But is there some f

Is there something that is fundamental to the cloud that promotes vendor lock-in? I can understand it from operating systems and retailers. But is there some fundamental obstacle that prevents most cloud services to be delivered by commodity RFC-compliant vendors? Or maybe some glue software layer, that, once you purchase a license, can abstract away the actual provider and make it simply a price decision? I understand the providers will fight tooth and nail against commoditization, but once the initial wave of innovation and savage competition has passed, do they have a fundamental tool to prevent it?