Wikipedia
Wikipedia is an online encyclopedia edited by people who may or may not be specialists in their fields. Because of this, the quality of any given Wikipedia article is highly variable, and some articles are downright wrong. Thus, Wikipedia is not considered a valid reference source for ACF and several mACF tournaments.
Despite this, many teams continue to use Wikipedia as their only reference source when writing questions. Several tournaments have sought to rectify this problem by introducing extremely stiff fees for Wikiplagiarism.
Currently, there is a $25 penalty for using Wikipedia as a source in a packet submitted to an ACF tournament.
Wikipedia apparently does not abide by its own conflict of interest rules.
Wikipedia has an article on quizbowl that is currently being bloated by people adding descriptions of Lithuanian game shows and arguing the quirks of middle school formats in Illinois. The article has no person with general experience in the topic of the article to give it a focus and prevent it from becoming a combination of a grab bag of trivia and a battleground for various uninteresting personal crusades. Thus, it is much like any article on Wikipedia.
Some current and former quizbowl personalities are very active on Wikipedia, notably including Adam Bishop and David Levinson. Conversely, Matt Weiner and Eric Kwartler would probably be more active in the anti-Wikipedia community if the "anti-Wikipedia community" actually cared about the legitimacy of references sources and was not just dedicated to online drama and calling people by racial slurs.