I'm confused. The article was about the United States, which has an enormous regulatory apparatus. You're saying that's irrelevant to multi-national corporations that operate here?
No. If some MNC is a global monopoly then the industry is lightly/none regulated by most significant countries.
Though, USA is an exception, achived arguably due to history of low market intervention. I would not say that the MNC does not care but achieving global monopoly in heavely regulated industry is very hard. Case in point, in banking industry (the most regulated sector), there is no private (or even public) global monopoly.
> In a mixed economy, monopoly exists because of state and market.
No. We live in global economy. Most companies have to compete globally. You might get favours from few countries but not most. Note whether your home country gives you a boost or not, is irrelevent. The success in a foreign country without its govt's blessing, is the question.