Even if I delete it, new garbage is still downloaded automatically. Why is there simply no disabling function
VaM itself has no "auto download" function, that's why there's nothing to disable. VaM does not automatically download anything. But there might be plugins that will provide something like you described, but then that's something you installed all by yourself, so go figure which plugin it is and disable/delete it.
Or -- just place the Vam_Updater.exe in a new, empty directory to create a fresh install, and then just "move" those packages you really want to keep from the "old" AddonPackages to the "new" one.