Interruption of internet in Delhi NCR, Uttar Pradesh and other parts of the country, that are grappling with unrest over Citizens Amendment Act and the National Register of Citizens (NRC), should also be seen as a caution against excessive dependance on digital payment devices and retaining some respect for cash. In not so good-old-days, ''cash is king'' would literally be the mantra of life. Then came demonetisation and everything changed for digital India.