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The ninth item of Wikipedia’s policy for non-free content states that non-free images should only be used in the article namespace (not disambiguation pages), and goes further into the underlying reasons for the policy.
This issue is important because copyright complaints are a very direct way in which Wikipedia could be financially harmed. Wikipedia operates on donations only. To have to respond to copyright complaints, Wikipedia ultimately needs to pay for legal counsel to help respond to these issues. Violating most policies on Wikipedia does not constitute a financial threat to Wikipedia. In the case of copyright infringement, violation of policy most definitely does constitute a very large potential threat if for no other reason than the cost of Wikipedia representing itself against plaintiffs in court cases.