There wasn't ever really a clean break afaik, and the association (some groups more than others) continued through at least the 1990s. Fairlight were active in both scenes for over a decade, for example, though from what I can tell the group did slowly internally divide in terms of who was focusing on warez v. demos. More to the point, though, I think the association with reverse-engineering culture had a significant impact on the technical culture and choice of tools/platforms. Unix culture had more of a C ethos, and less of a patch-asm-into-a-running-program type ethos.