In the wake of yesterday’s landmark ruling by Europe’s top court — striking down a flagship transatlantic data transfer framework called Privacy Shield, and cranking up the legal uncertainty around processing EU citizens’ data in the U.S. in the process — Europe’s lead data protection regulator has fired its own warning shot at the region’s data protection authorities (DPAs), essentially telling them to get on and do the job of intervening to stop people’s data flowing to third countries where it’s at risk.