[lkijuhyghjm]

There is a big tag at the bottom of each page saying you submit it under cc-wiki. This is a good thing, it's better than you having to read through 100s of pages of their own license to discover that they reserve the rights to put in a pay wall later.

[DanielStraight]

This is exactly Stack Overflow's (mis)understanding. The statement on the bottom of the page is that user-submitted content is licensed under cc-wiki. That they are granting you a license to use it under cc-wiki. The statement is not that you will license your content to Stack Overflow under cc-wiki. I can easily say, "The entire content of Hacker News is in the public domain." Without asking for permission though, this statement is meaningless. Same with Stack Overflow.