This is a good point, this it something that has happened (I've personally witnessed) and probably still happens from time to time unless wikipedia has worked to stop that sort of abuse.

Long story short, about ten years ago, my recommendation of a specific search tool (shareaza) to a friend went south, since it was over the phone. I'd found telling people to use web searches didn't work out well, wikipedia on the other hand, usually had an up to date address -- I no longer recall what trouble it caused, but I spent some time wondering what malware was redirecting to the bogus software site -- there was none, it was the edited entry at wikipedia. (When I tried the bogus software I recall it looked like it was doing something, but in fact it was doing nothing as far as searching p2p networks. Being busy I wasn't interested to see what its objectives were before deleting.)