So, I download ISO images occasionally via BitTorrent, mostly using Transmission Daemon. Having a decent blocklist avoids all kinds of nonsense, however, it seems to be increasingly difficult to find a blocklist that's been concatenated from the various lists out there.
Then I found this snippet:
curl -s https://www.iblocklist.com/lists.php | sed -n "s/.*value='\(http[^']*\)'.*/'\1'/p" | \ xargs wget -O - | gunzip | egrep -v '^#' > blocklist.txt
Voila, set that up via the cron or a jenkins job and here's the output: