Yeah yeah, everyone enforces their copyrights to the maximum extent possible. But this does not prevent massive amounts of both licensed copying and free use copying. The framework I outlined above is from the US Supreme Court's rulings on fair use so applies for everyone in the US.

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Re: #1, GN's work while commercial is an educational investigative journalism / documentary piece which are well established users of Free Use protection. GN's use is absolutely transformative.

#4: Bloomberg would have to prove a financial loss to have standing. That would mean that GN must have no other option than to use Bloomberg's clip, and pay the license, which I don't think would fly. GN would have just produced the segment differently.