Who owns the copyright to S[OFU] content?
According to the second paragraph of section 3 of the Stack Exchange terms of service (the paragraph starting with "In the event that You post or otherwise use"), a user must follow the Creative Commons Attribution Share Alike license even for content created by that user.
While nothing in the Attribution Share Alike license prevents a copyright holder from posting his or her content elsewhere (see this question), under a different license or without attributing its source, I worry that the Stack Exchange terms of service impose this restriction.
So does that paragraph prevent someone from posting content belonging to him or her elsewhere after the fact, without attributing its source under the Creative Commons Attribution Share Alike license? If so, then why was that paragraph included?
My intention: I intend to release some of my source code I posted here to the public domain, and I worry that the terms of service (not necessarily the Attribution Share Alike license) somehow hinder me from doing so.