https://econeveryday.com/author/michael-coon/ (Article Link)

Could someone provide answers and explanation to understand this questions?

1.Apple iOS and Google's Android OS represent a duopoly (two firm Oligopoly) with in the smartphone operating system market. Epic Games complain that the two firms' app stores are like monopolies. How is that possible? What is your opinion?

2.Apple launched their App Store well before Google entered the smartphone market. Google charges the same 30 percent fee as Apple. Explain why Google does not simply lower their fee to lure clients away from Apple.

3.Is Epic Games right in suing Apple and Google for locking Fortnite out of their app stores? Is Apple right for countersuing Epic Games for breach of contract? What is your opinion?