MADRID—The ride-hailing app Cabify, one of Spain’s few ‘unicorn’ tech startups, risks losing ground to foreign rivals such as Uber or Bolt in its home base Madrid due to a row over exclusivity with a company which employs 1,100 of its drivers. Entrepreneur Felix Ruiz, co-founder of the privately-held firm Auro which owns the cars and licences and employs the drivers, told Reuters Auro had decided to switch them to either Uber or Bolt or both from Jan. 20. The Spanish company could fall to No.2 in its home turf, as Cabify and Uber have about the same market share in Madrid, according to Auro estimates. Uber and Cabify declined to comment on their respective market shares. On Monday, Cabify said that an arbitration court ruling in June obliged Auro’s fleet to keep working with the app, but Ruiz, although acknowledging that Cabify had won the arbitration, said the contract …