I have to agree, these infamous ads are awful (if not dangerous, and I'm being too careful here; don't click it is my advice).
Today there is a new one, announcing you could advertise in that space.
is it the crisis?
Anyway, it seems with the next forum changes we will have more specific ads, related to tennis. At least it's what is expected. If the ads are annoying, I guess somehow they are needed to keep the site running.