Apple has no monopoly
They sell a minority of phones in Australia. Just because they require their own payment solution on their phone doesn't make them a monopoly.
The economic definition of a monopoly is where a single company or cartel owns all or nearly all of the market for a single product or service. You can't define a market to be a single company's product and ignore all the competing products that clearly exist and are purchased by a majority of consumers just to claim that single company has a monopoly.
If the iPhone did not exist, and Android had all the share that iPhone has now, Android would be considered a monopoly and subject to scrutiny under such laws. (The EU apparently has lower thresholds for what is considered a monopoly, and may potentially consider Android a monopoly even with Apple's presence in the market)
This sounds like a trojan horse - I'll address that in a separate post.