I thought maybe you thought that WAV was purer than FLAC

Soundcloud is one! Some artists let you download their music and others don’t. Other than than Soundcloud isn’t open source, I don’t see what’s wrong with them.

Just convert it with FFmpeg

It’s is not a propaganda, it is just what copyright law is. Unless people waiver their rights specifically, purchased music is always licensed to you.

Meaning you cannot share the file to anyone else, because if that was the case anyone could buy it and share it with anyone else, making the concept of purchases void.

The only fair alternative would be to make the music a one time purchase of Price per user * Number of Expected users so that the artist gets their fair money and people can buy it by pooling money.

That is stupid, but that’s how copyright is.