Why would I use the global market share to determine if someone has a monopoly, though? It seems like a flawed way to determine how much choice consumers have.
For example, there's a monopoly on garbage service where I live, but he company with the monopoly has basically 0% of the world market.
How do you defend a company with 30% marketshare being a monopoly but the other company with 70% market share isn't? I can see the duopoly argument, but no idea how apple could be a monopoly by itself