Github is fairly aggressive these days about alerting you to put a standard license in your repository.

But they still remain with the problem that most folks choose the user-friendly MIT (I would, and 9 out of 10 of the top projects do). This leaves them with an issue: It's not clear that contributions submitted to an MIT project grant permission to incorporate those contributions under the same terms. We understand it socially, but it's not legally explicit.

Github has been trying to address this in their Terms of Service, by saying that simply by using the site, you agree that "inbound=outbound": https://help.github.com/articles/github-terms-of-service/#6-...

But the Github TOS isn't really the right place to be legislating that. For more, see: https://writing.kemitchell.com/2017/02/16/Against-Legislatin...