This is exactly what I was thinking. Is not the US export far higher than import if they take into account the software and other IT services they sell?
I would expect other countires to tarrif that.
Like other comments said, this could work only if this was long term and everybody bites the bullet until they have a good local alternative to foreign offers with high tariffs. And the chances of having a lower offer as the one you were importing are really high. So, everybody is betting on short term.
The good thing is: If the EU finds a way to tax the money flowing from advertisers to big tech, consumers would not be affected (at least not financially), because they are not the ones paying the price.
You gonna tax their real customers, the advertisers. And a 100% tax on advertisement is actually healthy for the economy and society.
Those are free for consumers, but Google Suite (Mail, Calendar, etc.) for enterprises definitely has a price.