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Nvidia offices raided by French competition authority
(www.theverge.com)
This is a most excellent place for technology news and articles.
A monopoly is not necessarily connected to takeover of other companies to grow, so yes, they can be a monopoly. Also, iOS might have that market share in the US, but there are plenty of other markets dominated by Android. And lastly, 80% is a significantly larger market share than 60%, obviously.