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When hovering over the "protect" link underneath a question (15k+ users), the title text reads:

disallow answers by anonymous and very new low rep users

Isn't the anonymous users part irrelevant, as users must sign up to post on the site?

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up vote 8 down vote accepted

No, you have to sign up to ask questions on Stack Overflow.

Unregistered users are still allowed to answer them (unless protected, of course).

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Users must sign up to post questions, but they can still post answers (to any question).

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