Yes. This is what I meant regarding what the problem is. The mention of SUNDR was more of a side comment on how one might implement a service whose only job is

Yes. This is what I meant regarding what the problem is. The mention of SUNDR was more of a side comment on how one might implement a service whose only job is to store your data without being able to understand it. I wanted to point out that it is possible. But this is a technicality anyway. The big questions are: (a) What does it even mean to require that the cloud companies provide you with a mechanism of converting the cloud data to some common format that you can use without the cloud app. In some cases, there might be no such common format. And, (b) Do cloud companies have an incentive to play along and provide you this way out. It would be work for them. Somehow they need to care. These are questions with unclear answers. Yet, the problem stays: your time and data are completely unprotected. What is more problematic is that the common user is not sophisticated enough to be aware of the (high) chances that the cloud app they use will go bankrupt and shut down leaving them with nothing.