For a while, it looked like President Donald Trump was going to have Big Tech’s back.

Now, the tech industry is collateral damage in his global trade war.

On Thursday, European Commission President Ursula von der Leyen floated the idea of placing “a levy on the advertising revenues of digital services” if tariff negotiations with the US go south. This would be the opposite outcome that tech CEOs like Mark Zuckerberg were hoping for when they threw their support behind the new…