Even Napster was used for non-music stuff towards the end, by renaming archives as mp3.
And the basic protocol was later adopted for more generic sharing systems, never mind the number of clones that came about after Napster was lawyer bombed.
Bittorrent is just the latest in a long string of P2P systems, with the biggest difference being the lack of a central search server.
Yeah, I remember we had to put an MP3 frame checker in the app to help prevent them from being shared. We had enough legal trouble with just the music industry suing us.
I get the feeling that there is a second aspect to it, netsec fundamentalism.
People so deep into CVEs and such that they see every computer as requiring the digital equivalent of fort Knox level security, or civilization will fall.