I wonder if spotify cares about it that much. I looked at the article and it says the archive is 160kbps files and 96kbps files, while spotify can stream 320kbps files and recently lossless audio files, and of course there’s the app itself.
But yeah I agree that the audio file itself probably isn't super important to keep secret. After all, it's not that hard to find cd rips or at worst, a youtube version to download.