> The Anna’s archive group is ideologically motivated.

Very interesting, thank you. So using this for AI will just be a side effect.

And good point -- yup, can now definitely imagine apps building an interface to search and download. I guess I just wonder how seeding and bandwidth would work for the long tail of tracks rarely accessed, if people are only ever downloading tiny chunks.

I think the people seeding these are also ideologs and so would be interested in also supporting the obscure stuff, maybe more than the popular. There is no way any casual listeners would go to the quite substantial trouble of using these archives.

Anyone who wants to listen to unlimited free music from a vast catalog with a nice interface can use YouTube/Google Music. If they don't like the ads they can get an ad blocker. Downloading to your own machine works well too.