Apple's market share in the US is 39%. Even if they were the primary source of applications for that 39%, 39% of a market does not a monopoly make.
You compare alternative app stores on Android devices to apple alt stores requiring rooting an Apple device. Very different and not an equal comparison what so ever.
Then referring to PWAs existence as an excuse for apple not having a monopoly to their device ignoring the fact apple has resisted PWAs in general and has taken a long time to even allow them to do something as basic as permit notifications.
Your attempt at equating the two is very obviously flawed.