Somewhat disingenuous to boil it down to this, when it's merely one of the ways presented with 4 other ways of installing it, including downloading the binary,

Somewhat disingenuous to boil it down to this, when it's merely one of the ways presented with 4 other ways of installing it, including downloading the binary, package managers, building from source... Looking at said install script it's also pretty much just figuring out the host OS and architecture, downloading the corresponding binary, checking its integrity and copying it in place.