So here is what the locked and closed question banner say.
Locked questions:
locked by
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♦<date>
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This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. This question and its answers are frozen and cannot be changed. More info: help center.
Closed questions:
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Probably some of the most loathing notification for the asker.
So moderator lock a particular question because the question is not considered a good, on-topic question for the given SE site then why locking the question transfers the question in community wiki? I mean I used to thought that community wiki have a collection of good questions.