Well, it's practical on a small scale. You could wait until a torrent has only 1-2 seeders, and then you can hope to give leechers all blocks of a file. Or, you

Well, it's practical on a small scale. You could wait until a torrent has only 1-2 seeders, and then you can hope to give leechers all blocks of a file. Or, you could deliver a torrent with a 1GB installer (for some software package) and a 100kb keygen (which you replace with malware) fitting inside a 1MB block and you can be sure to spread that around regardless of the number of other seeders.