I first saw it with Homebrew over a decade ago. It made it more linux, it's true. (Of course now that its for linuxes too, so they get to be more like macs.)

I see archive.today has the charming old ruby version on the bottom of a 2013 brew.sh page in 2013, when I must first have used it https://archive.ph/lCqJ1

    ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"