Wikipedia introduces the "no-follow" tag

Wikipedia has introduced a rel = "nofollow" tag that is evidently used on all outbound links. This was evidently done to reduce link spam that is part of Black Hat SEO. However it is applied indiscriminately to all links, including those on which the articles are based, which makes it somewhat unethical. What it will mean is that the gigantic volunteer encyclopedia which Google lists as #1 for so many keywords will perpetuate and increase its web dominance at the expense of other Web sites. It means that nobody but Wikipedia can be number 1 for an informational keyword niche. At least in theory there could be an excellent article, much better than Wikipedia's for a given subject at a different Web site, but it will never exceed Wikipedia in the listings because no site is probably going to have more pages and authority than Wikipedia. This shows an important weakness of Google PageRank which bases authority and positioning on the number of backlinks