You don't stumble randomly on such a mutable torrent. If you know git's data model, usual torrents are like commits, and those mutable torrents are like branche

You don't stumble randomly on such a mutable torrent. If you know git's data model, usual torrents are like commits, and those mutable torrents are like branches: If you give someone a commit there is trust that it won't move, and if you give them a branch name, there is expectation that the actual commit pointed to will change.