Google will reduce Play Store cut to 15% for a developer’s first $1M annually
theverge.com
theverge.com
Think of it this way, without the App Store, would the app developer be able to make more than 100B earnings? There's very little incentive for Google and Apple to reduce the cut on their platform, doing so can cause an escalating chain of events that would reduce their revenue and significantly impact their key stakeholders.
I could use your same argument - without all the App Developers making Apps, would Google's App store make any money at all? No, of course not. See Windows Mobile, as an example of what happens with an empty ecosystem.
Ultimately what we need is freer hardware and freer fundamental software (OS, browsers, etc) that does not have controlling interests from these entities no one elected.
Are they a monopoly? I am not sure if it meets the current definition of one in practice, since seemingly no antitrust action is taken on by the government these days. But in my mind Steam is a monopoly for digital game distribution on PC. You could argue that consoles constitute a similar monopoly within each console's platform, I suppose. And you could argue that not all games are sold via digital distribution. But I think we need a new modern anti-trust law that doesn't rely on a very high bar like a "monopoly" but some other less stringent definition.