0-popularity, not 0-streams, which are two different metrics according to the archive blog post. But nevertheless, the re-encoded stuff is stuff pretty much no one will miss. Also Opus at 75kbps is much better than Vorbis or mp3 at that bitrate.

And that's why I think it's an issue. The least popular tracks, which are the most likely ones to disappear from the internet, are the ones they store in the lowest quality. While I'm glad they made this huge effort for preservation, and understand the limitations of storage space, I also wish they would have at least preserved the original 160kbps streams.

There is probably a lot of listening data that could be useful. Say you like a particular song, you could look at what other songs people who stream that do also streamed a lot?