I don't think that answers anything. Just because some anonymous poster put code online doesn't make it usable under the MIT license no matter what the ToS of the website says. The poster may have copied that code from a GPL code base...
That's true even if you find code on GitHub explicitly labeled as MIT, CC or Apache.
If you're worried about using code from stack-overflow, use it as inspiration only and write your own code. Or conduct a short search first to see if it WAS copied from another code repository.
There's a big difference between a git contributor explicitly saying their code is a subject to a certain license and SO magically declaring it to be so for all code on their website just because it happens to be in their ToS. I think a better system would be to ask people providing code snippets to specify what license it's subject to.
