You can't source encyclopedia brittanica either. Wikipedia isn't banned because it's a wiki, it's banned because it's an encyclopedia.
But apparently the people who write these articles have never actually been to school, so they think that wikipedia not being allowed as a source for college papers is somehow a significant indictment.
To me, they should use Wikipedia as an example of the necessity to use sources when teaching about bibliographies in school. The reason I trust wikipedia, is because it's properly referenced. And in some cases, if it's not, it'll even let me know.
Wikipedia is a fantastic tool to find direct sources.
Is that honestly the measure of how perfect a source of information is?