> "You're getting all this stuff for free."
Of course.
Part of packaging something, and then releasing it through a distro's package manager, is that it goes through the distro's release process; someone reviews it. It becomes part of the distro. In particular, if it goes into something like Debian's "main" repository, I'm inclined to trust it almost as much as I trust the core OS release.
I'm not going to man battlements anywhere over this kind of thing; but I'm not going to execute arbitrary shell scripts downloaded from the internet without reviewing them; and 600 lines of shell-script is more than I want to review, unless I'm super-motivated. If the only way of installing a package is Docker (which I don't care for) or wildcat script, and that package has no maintainer for my chosen distro; that's fine, and I'm not going to beat up the developer. It's not his fault, nor his responsibility.
So instead I generally look for an alternative package that's shipped by my distro. I don't keep a record of all the wildcat software installed on my systems, because there usually isn't any, and my package manager knows exactly what's installed.