Yuval Harari: Pervasive digital surveillance will offer numerous ways to determine who is homosexual — or even has an unconscious leaning that way — for the sake of persecution. Likewise for any other quirks that people could be mistreated for.

If you belong to some group that is targeted — blacks, Palestinians, animal rights campaigners, whatever it — the secret police of your country won't hesitate to use your quirk to force you into informing.

This is another reason we must stop systems from collecting data about people.

Make or sell TVs that reports on people? Go to prison! Put up a camera that identifies people? Go to prison!