None of the addons I installed have anything to do with piracy.
LibreELEC follows Kodi's list of banned builds, wizards, repositories and add-ons, which are known to facilitate video piracy. Such repositories don't come bigger than Superrepo. They also do not auto-install themselves.
So again, remove any superrepo related add-ons & modules as well as the superrepo repository itself from your LibreELEC setup, in order to continue the request for support as per forum rules (which you agreed to during your registration).