StatCounter measures web usage,
not market share. iOS users tend to jump into Safari and browse the web from their devices more than peer devices, quite contrary to the conspiratorial noise often spread on here.
By actual sales of devices, iOS accounts for between 41-46% of the market. That users on iOS tend to use the web more from their devices doesn't somehow make it a monopoly.
And to be clear I don't think whether it's a monopoly or not is particularly relevant -- it's still arguably abusive, anticompetitive behavior -- but that misleading statcounter claim is used for disinformation on here daily.