Wikipedia is extremely biased and, more important, it is not the internet. If you teach people that internet is cable tv 2.0 very bad things will happen.
However a) this research is very US-centric b) the paper also concludes that code word per word is pretty much equal between the two, wikipedia just has longer articles
1. https://hbswk.hbs.edu/item/do-experts-or-collective-intellig...