Comment by zenoprax

Every change to the source is effectively a new torrent. This creates a ton of fragmentation as data is reorganized, remixed, reencoded, and so on.

You can see this with many Linux distros: there is no single Debian torrent that people seed for years because there's always a refreshed version.

Distros are a bad use case for P2P anyway since you depend on upstream as soon as you start upgrading and installing packages.