Uber is a taxi company. That’s the ruling today from the European Court of Justice, the highest court in the European Union, which interprets the union’s laws and ensures their application across all member states.

Uber, of course, has long resisted that label. It presents itself as a digital platform for connecting people, rather than as a taxi service. But a Barcelona taxi association  challenged that claim in court in 2014, frustrated that Uber’s revenues had been partly and unfairly bolstered…