In the Russian capital Moscow, 100,000 surveillance cameras were equipped with facial-recognition technology just before the start of the Covid-19 pandemic. Since February 2020, thousands of Muscovites have been confined to their homes under 14-day compulsory quarantines for those with a history of travel to coronavirus-hit countries, contact with those infected or a Covid-19 diagnosis with mild symptoms. But some worry the cameras are used without consent of those being filmed, and that the…