I think the biggest threat that the US government sees in crypto currencies is the ability of adversarial countries (Russia, Iran, etc) to avoid sanctions. If y

I think the biggest threat that the US government sees in crypto currencies is the ability of adversarial countries (Russia, Iran, etc) to avoid sanctions. If you want to conduct international financial transactions, you must do it in US dollars, and the US government controls that. In the future, if governments (or private entities) can get around that, then the US doesn't really have any non-military leverage. The US government seems interested in Libra because if it grows and becomes the de facto crypto currency in the future, and they have a good amount of control over it, then they don't lose any power. Then again, they might lose control over it while Facebook just hustles everyone for their data and money. France and Germany are probably interested in the international financial systems being stable, but are probably a lot less inclined than the US to bet on Libra because they don't control the US dollar right now anyways, and if anything goes sideways they can't really control FB either.