Generally no. Illegal threads are only removed if they outright illegal everywhere. But, for example someone selling marijuana isn't going to get banned, because its legal in certain places. Generally, its up to the user that's trading to determine whether they can get in trouble for it or not.

This is also pretty situational. At least for me. It really depends on what type of spamming they are doing. But, even if I recognize they are bots or users that copy and paste I generally take the side of caution, and only nuke them if they are continuously doing it.