Yes, I imagine it on a daily basis. That's how the cloud works. It's happened before, and it will happen again. Any cloud based data is bound to disappear at any second because of a hack (ask Matt Hunan), because of a court order you are not aware of, because of an in-court-or-out-of-court settlement you are not part of and not aware of. Lots of reasons. That's why I don't actually trust the cloud as anything but backup.
Furthermore, anything not backed up offline (even if there's an online backup) is also in danger from malicious actors.
The only person to blame for not keeping a backup (of just the song titles, no less) is yourself. Use expletives if it makes you feel better, though, by all means.