They won't, in fact, I'm almost certain that the people at Epic responsible for writing UE code are forbidden from looking at this source code. Keep in mind, it's still under license! Using it without a license is still illegal and could get anyone including Epic into trouble. The only thing Epic could potentially do is a Clean Room Design, but that's not really worth the effort.

I know for a fact that I won't be looking into the source code, but then again, I also never looked at the UE code for that same reason.