In theory, this could be in the realm of a copyright violation:

https://help.github.com/articles/dmca-takedown-policy/

Although (and I am no expert) when your license is sufficiently broad and allows for behaviors you saw (e.g. “please include the original header” is not the same as “you must include the original header”), GitHub might decide that there is no violation, technically.

Unfortunately there are lots of behaviors in the world that are legal even though they’re despicable. Your best bet is to be very clear what you want people to do with your projects, e.g. state copyrights, add licenses that are not too liberal if you want restrictions.