No, those are not ads as part of site funding. Advertisements are against the rules. We try to catch them and delete them as soon as they pop up, but it sometimes takes a few minutes. They're also not as easy to detect for the system as some other spam, so we need to do this manually. If you come across them do not post in those threads but just report them, that's it (you can see if a thread was already reported if there's a small flag on the top corner to the right hand side).