Sure, their marketing copy says it's intended for storage, but that's not how it's actually used in the wild. In reality, it's primarily used for interactive/real-time streaming and not used for storage. I think it just boils down to the idea that the storage formats we're using are more than sufficient, and Opus doesn't really bring much new to the table there. It does, however, perform remarkably better than most/all of the alternatives when dealing with (e.g.) VoIP, so it's no surprise it's been adopted there.