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So, by a metric you yourself admit is flawed (and I assume it is flawed, I couldn't find any methodology from statcounter), the initial claims were off by 15%, which is a huge mistake and significantly weakens any 'monopoly' argument.

> OS market share is higher than that as some Mac users will use Chrome or Firefox, but no users of other platforms use Safari.

No, and the source you initially provide show this not to be the case: https://gs.statcounter.com/os-market-share/all/united-states...

OS marketshare is actually lower than browser marketshare. Mac users using Chrome or Firefox have nothing to do with it, since the heuristic statcounter relies on, the User Agent, contains clear information about which OS is being used.