There's no way. GitHub is already pretty hostile, but the only people who care — like in most hostile platform cases — are the ones who are directly affected.

It's a reputational thing. There is already a trend of exodus from GitHub. This Oracle style garbage will just exacerbate it. Whether they care - who knows, but it can be a reason.

But in general - as a developer you surely don't want to host your projects using someone who thinks APIs are copyrightable.