The point is that Wikimedia is blatantly breaking Google's spam guidelines. Whether they sell links on Wikipedia or Wikimedia domains makes little difference as

The point is that Wikimedia is blatantly breaking Google's spam guidelines. Whether they sell links on Wikipedia or Wikimedia domains makes little difference as to their effectiveness in improving spammers' rankings in the search engines. It is not "lucky" for Wikimedia. It is an exploitation of Wikipedia's power and as the cited email shows, they know it.