Call me stupid all you want, but I was looking for a clause that prohibited running unauthorized benchmarks, and neither my nor your search results corroborate​ that.
I was at an AWS Aurora talk and someone asked the presenter (VP of DB engines) if there is a benchmark comparing Aurora to Oracle and he said that they are unable to do it because of licensing agreements.
The first result is a blank copy of a license agreement that they presumably forgot was on their website.