Thread:SW8573/@comment-151.77.79.51-20130708151321/@comment-3153244-20130709140142

If you are an anonymous user, you cannot remove more than a certain number of characters from a page, even if it is reverting spam/vandalism. This is automatically done by Bloons Wiki's abuse filter; it seeks to prevent anonymous users from blanking mainspace pages. However, since it is not human, it cannot distinguish between a legitimate, constructive edit and one with harmful intent.