1) Topics are locked for stupidity. One can not just ban a user who spams a topic. In general, if it's a topic that even one user spams, it is likely that it will be spammed by another user. Likewise, topics that are stupid/redundant/serve no purpose are generally locked as well. Chances are, if it's locked, it's not a good topic to begin with.
2) Bans are done via usernames when first applied. If one does not evade the ban, one may still view the boards as often as desired. However, if one evades the ban, then an IP ban is instated. Someone who is banned and can not view the boards is in such a predicament because he or she evaded his or her ban. Banned users' avatars are removed, I believe, also.
2) Bans are done via usernames when first applied. If one does not evade the ban, one may still view the boards as often as desired. However, if one evades the ban, then an IP ban is instated. Someone who is banned and can not view the boards is in such a predicament because he or she evaded his or her ban. Banned users' avatars are removed, I believe, also.