Apple certainly has a duopoly with Google in both the mobile operating systems market, and the mobile app distribution market.
iOS has 60% of the market in the US[1], and Android has 40%, and Google and the App Store is responsible for 100% more revenue than the Play Store[2].
Also, layman definitions of monopoly do not matter when it comes to antitrust laws[3]:
> Courts do not require a literal monopoly before applying rules for single firm conduct; that term is used as shorthand for a firm with significant and durable market power — that is, the long term ability to raise price or exclude competitors. That is how that term is used here: a "monopolist" is a firm with significant and durable market power.
> When there’s a market with only two players where #1 has 75% of the market and #2 has 24%, describing #2 as being part of a monopoly is inaccurate.
It's very strange that you think worldwide market share has anything to do with market share in the US when it comes to antitrust laws in the US.
iOS has 60% of the market in the US[1], with Android taking the remainder. Apple and Google form an effective duopoly in the mobile OS, app distribution and app payment markets. They both form a mobile app distribution cartel that engages in price-fixing[2].
Again, your colloquial definition of monopoly doesn't matter when it comes to antitrust laws in the US. Please read this[3].
iOS has 60% of the market in the US[1], and Android has 40%, and Google and the App Store is responsible for 100% more revenue than the Play Store[2].
Also, layman definitions of monopoly do not matter when it comes to antitrust laws[3]:
> Courts do not require a literal monopoly before applying rules for single firm conduct; that term is used as shorthand for a firm with significant and durable market power — that is, the long term ability to raise price or exclude competitors. That is how that term is used here: a "monopolist" is a firm with significant and durable market power.
[1] https://deviceatlas.com/blog/android-v-ios-market-share
[2] https://www.businessofapps.com/data/app-revenues/
[3] https://www.ftc.gov/tips-advice/competition-guidance/guide-a...