I get why there are people that don’t like how some installers do this, but this trope is really turning into the “but I don’t even own a TV” of OSS commentary.
Just use the Docker image if you don’t like it. Or get their appliance which actually supports ongoing development.
tiny_installer.sh
#! /bin/bash
curl www.url-you-didnt-check.dev/the-real-installer.sh | sudo bash -