@nonlinear are you thinking of Brave support for IPFS? I know PeerTube uses webtorrent which I believe lets you do torrent downloads in any JavaScript + WebRTC supporting browser?
It would be interesting to learn more about Bandcamp's infrastructure for streaming. I believe their downloads come from Fastly CDN. Having infrastructure set up to Just Work and not be some tech experiment is part of why working with the web we have is important.