This is from ignorance, though. I've never really cared enough to look into it, but I tend to not do anything "out of line" with the games I buy anyway, especially in online games that seem have the most user agreements and contracts etc, so I guess I don't see it as "my battle" or whatever.
Not entirely related, but speaking as a creator, I want to both publish my own games on storefronts so that people can buy them if they want, and make a free torrent for them, and I want people to be able to mod the game if they wish. I wouldn't want to bog them down with a bunch of clauses telling them they can't cheat or whatever.