[fyoving]

If my math is correct then most of the companies are American, and by far most of the potential revenue.

Considering the rhetoric leading to this tax and the french government's many raids and failed investigations into US companies and their taxes it's difficult even with careful wording for the french government to deny the actual target of this tax in a WTO type setting.

[etripe]

Maybe the US should be targeting those companies, too. I don't think you can really say a multinational still is or acts "American", even if a majority of its employees and its owners are.

[JAlexoid]

For tax purposes most of those companies aren't even American. Apple, Alphabet's subsidiaries, Microsoft, Amazon, etc. are companies registered in Ireland or Luxembourg, or the likes.