That's why no one should rely on any "music cloud". The best solution is relying on oneself.
All my data, 8 TB worth of media and other content is available on internet 24x7, and I don't need to pay anyone a single penny except the internet fee (which I would pay anyway) and my investment in a NAS hardware (which, again, I would invest anyway, due to local storage and fast access needs).
The music cloud or other such clouds will remain popular among the average Joe though, people who are not tech savvy or would just prefer to simplify their lives by outsourcing their needs.