So, more anecdotal evidence. If you really trying to say that your personal experience and experience of few other people proves that even trivial filtering is not being used, my arguments won't change anything, you already know everything, it seems.
The argument that there is a filter set up to block spam can be disproved by a single comment that would have been blocked by such a filter. I'm not sure what kind of evidence would actually sway you, but it seems fine to me: 1. widespread spam exists, 2. a week later it's still happening 3. therefore any filter is not set up in a way that blocks spam.
