..and will that have any effect?
Currently, I want all of my contributions on StackExchange to be available not just under SE's licensing terms (that goes without saying), but also under a version of "Unless you're preventing other people from using it, fair game" kind of license.
Is that legally somehow possible without rehosting all of my content on say github?
To elaborate: I want people to be able to do anything they want with my code, without attribution, and the only thing they shouldn't be able to do is prevent other people from using my code. That means that I don't need or want credit and that the code can be used as much as anyone desires in any application.