True, but I'd reverse the order. It's npm, pip, cargo, gem and all the others that are like the AUR. They're every bit as dangerous as the AUR, yet the AUR is the only one that singles itself out by warning people of the danger.
Anyone can sign up and push packages. I've literally done that myself, even though nobody in the Arch Linux community knows or trusts me. AUR is the only one where users are repeatedly made aware of this danger. All the others normalize and encourage importing random unvetted dependencies for the sake of developer convenience.