To leech, leeching and to be a leecher has been around since people used to download warez. It far predates torrents.

I remember a local sysop in the 80s who ran an Apple II ASCII Express download site with two 5.25” floppy drives. You’d write him a text message and save it as a file. He was a cab driver and he’d come back home once in awhile and check the messages. If you were lucky he’d put your requested software in the second drive and maybe you’d check back in time before he fulfilled someone else’s request.