It is about time for companies that consume these public cloud services to use them in a way that they can exit/leave/migrate easily.
It is the job of the CTO to put in place a strategy to use public clouds to inovate and grow fast and then easily move stable applications to a cheaper (and eventually more static) environment, such as a private cloud. Otherwise infrastructure costs will kill your business.
Hybrid cloud is the way to go.
This post is a reaction to several posts and articles that appeared on LinkedIn.