Comment by stevenicr

someone in your household adds a 'free vpn app' to their device and that app sells off portions of your bandwidth to others.

Someone has a cheap android tv box or similar unpatched thing with your wifi password

(one botnet alone has over 1.3 million android boxes working for it as of this week - https://www.securityweek.com/1-3-million-android-tv-boxes-in... )

Someone start cobbling lists of these so I can block them in a different way.