it doesn't seem to have come up on debian-legal in the last year or so https://lists.debian.org/debian-legal/ but debian-legal is also kind of a shadow of its former self
you could easily imagine fedora distributing their own build of software whose licensing fails to comply with the debian free software guidelines; bundling proprietary software used to be common in linux distributions in fact
https://bugs.debian.org/cgi-bin/%3Ca%20href=%22bugreport.cgi...
So far no one has mentioned licensing being an issue.