Definitely a use case for bittorrent.

If the data changes, how would a torrent client pick it up and download changes?

	▲	hambro 11 hours ago \| parent \| next [-]
		Let the client curl latest.torrent from some central service and then download the big file through bittorrent.
	▲	maeln 10 hours ago \| parent \| prev \| next [-]
		A lot of torrent client support various API to automatically collect torrent file. The most common is to simply use RSS.
	▲	extraduder_ire 10 hours ago \| parent \| prev \| next [-]
		There's a BEP for updatable torrents.
	▲	Klinky 10 hours ago \| parent \| prev [-]
		Pretty sure people used or even still use RSS for this.