A cheeky license, or, worse, no license at all is a potential hole for a lawsuit. That is, of time and money wasted, and of the project being at risk.

I see why you might go with Apache, or MIT, or even straight public domain licenses. But as a maintainer, I would not accept a contribution which is not properly licensed, or which is licensed in a way not compatible with the project's license. Usually such a contribution is less valuable than the rest of the project, so there's no point to introduce a real legal risk of project's closure for the sake of such a contribution.