One of the more recent features added to SO was a timeline of activity and within the timeline you can see which license each the question is under. Here's an example for a random question https://stackoverflow.com/posts/49083680/timeline .
It's kind of weird that while the questions have a license declared the answer don't ... not sure what that's all about.
They can’t legally retroactively change the license on existing content though - and as soon as they change their EULA to say “You irrevocably assign copyright on your postings to us” then they’ll lose their thought-leader users - and the rest tumbles.
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