I flagged this answer (now deleted, so I can't repost its whole text) as spam. I was later greeted by this message in my flagging history:

declined - a moderator reviewed your flag, but found no evidence to support it

Now, it looked to me like there was lots of evidence. The post was just a link to a software download page, and the only context given was that the software is allegedly the best. I had literally never heard of that software before, and the poster offered no guidance as to how to use it to accomplish the task. The link wasn't even formatted correctly; clearly, the user didn't care about helping, just about mentioning the product. The user has only 1 rep, so it's not like they were around a while and well-meaning.

Clearly, the answer was low-quality, and bad enough to merit deletion (I think through the LPQ queue). If flagging as spam was wrong, what should I have done with the post?