Sounds like an opportunity for a new company that abstracts away the actual different cloud providers, provides redundancy, and provides a security abstraction layer that prevents cloud hosts from knowing what their segments of files are for.
Then it will be that company which deletes your files because you broke their ToS :)
And when that service is abused for piracy, CP, and other illegal files; it will start the ball rolling that inevitably drags it down legally to the level that DropBox is at.
The storage providers should just charge 3USD per year from a card. I guess that prevents like 99.99% of spam and CP problems.