Alternatively, Amazon is using stow, a common GNU utility whose info page refers to a version of Perl released in 1992, or something similar to it, instead of Nix and Guix which didn't exist when Amazon started.
It used neither, but it's own implementation of the concept ("symlink all the things!", which is much older than both, and has lots of other implementations too, aside from Nix and Stow.
Would Amazon rely on stow when it is in this peril? Unless they really do rely on it and maintain an internal fork, which would make this situation even worse. Or they use it anyway...