Not only do we have to add our license, we have to mention the licenses of our datasets.
Under Project Requirements of MLH handbook for Orientation Hackathon:
The project must be “Open Sourced” (i.e. made available on GitHub with an Open Source license) at the end of the hackathon.
Not only do we have to add our license, we have to mention the licenses of our datasets. Under Project Requirements of MLH handbook for Orientation Hackathon: