Is there a good way of preventing unauthorized javascript injections? Some type of onReady cleanup script that can identify what is supposed to be there and then strip out everything else?
It's installed by the ISP's setup program which they tell everyone is mandatory (otherwise they won't get the adware kickbacks) and the techs are discouraged from skipping.
How often that does even happen? Many people just get a router (w/modem) in the mail which they just connect to with their devices. No software is being installed.