I wholeheartedly agree, yet this is the same for stuff like the AUR, every PPA, or even just blindly copy & pasting inductions from some blog - all of which are very popular. (Just to name some examples that are closer to what op wants to do).
I still wouldn’t use scripts from a random dump site because they are just likely to mess up the os with junk and cruft that will be there forever. But fundamentally from a security point of few its not necessarily worse than what many are doing - simply because it doesn’t get worse than blindly executing stuff from sources missing the reputation to justify trusting them.