I competed in a couple of the early CAL seasons legitimately (main and then invite). Most of us never condoned cheating in league play or even in most public servers. That's the part where you're ruining games for other people. There were, at one point, quite a few servers dedicated to cheating, however, and even a competitive scene to see who could make the best cheats.

But leagues actually made things more interesting. They started creating their own anti-cheats and those were just new shiny toys to break as well. It's quite satisfying to defeat them, even if the goal isn't to cheat in a league.