1) You're lying. Read the article - it's not all American companies. [Edit: parent changed their post after claiming 'All' the fines were to US companies]
2) Perhaps if it's mostly US companies it's because they are more abusive of their market power, a mentality incubated in the lobbying culture of American politics and corresponding spinelessness of regulators.
I believe Trump stance on China is being diluted by using the same quota for allies such EU, AU and CA and seeking better conditions for countries such Russia. Some of the terms he is trying to impose will never be agreed(i.e lower food safety standards in the EU).
Fair point. I however don't agree fully. One could argue that there's not as much urgency in adjusting quotas for EU and similar allies but they too need to be checked because of the way they treat US co.s especially those in the tech sector.