Comment by arjie

They are not widely publicized but they cannot be entirely secret because when you use AWS Direct Connect you need to know where to do the work in. Not every AWS datacenter has Direct Connect, but any OSS intel person could do the work required. When you have sufficient incentive to know where (for instance, trading crypto) you will find out the difference between, say, a matching engine running in AWS's datacenter run by AT Tokyo or by Colt.

AWS does not publicize all of their stuff, true, but they have partner documentation, their partners are proud to be vendors to Amazon and will advertise, and there are old unlisted PDFs on the Internet. Besides, Amazon has thousands of employees and contractors and their families. This kind of thing is within reach of any human being with sufficient interest.