I think that there are very few people who try to fight spam in general, and when someone uses such insidious techniques, then the matter becomes even more difficult because people have a hard time deciding on any action. I personally haven't seen too much spam regarding the sig campaign mentioned above, which means that they chose parts of the forum that are not the focus of active reporters.
I have a question about reporting such posts, If the user edits the post before a moderator can check out the report, what would be an appropriate response to it? Especially if the new post is not worth deleting.
A problem arises for the moderator, because the post is obviously not what it was initially reported for, and it all boils down to whether the moderator wants to check it in the database of archived posts, or whether the reporter archived it and added a link to the description of the reported post. I'm not sure what the moderator would do in such a case, but it seems to me that the majority would leave such a report
unhandled or maybe even mark it as
bad.