Services aren't traditionally part of tariffs; tariffs apply only to physical stuff moving across borders.

That being said: I work in a services-oriented business right now "exporting" services to the U.S. and the leadership of that company is seemingly getting very worried, trying to diversify their customer base out of the U.S.

If, in the cycle of retaliatory action, they run out of ammunition with tariffs on stuff, who knows what other crazy ideas will come to the surface: Tariffs on services do come to mind, maybe restrictions around recognition/enforcement of foreign-owned intellectual property,...