I don't think you can measure leverage in revenue. Leverage isn't about money: it's about power. https://en.wikipedia.org/wiki/Leverage_(negotiation) https://en

I don't think you can measure leverage in revenue. Leverage isn't about money: it's about power. https://en.wikipedia.org/wiki/Leverage_(negotiation) https://en.wikipedia.org/wiki/Leverage_(negotiation) Leverage isn't about "the market", either. It's about the individual people, and their situations. The iOS App Store doesn't give Apple much leverage over iPhone users, but iCloud does – and, to a lesser extent, iMessage¹ and FaceTime do. (The flipside of the iPhone's many planned obsolescence strategies is that you have to choose whether to remain within Apple's ecosystem every three-to-five years, and iPhones are expensive.) The iOS App Store does give Apple significant power over the authors of apps. Even if the App Store doesn't provide a chokepoint by itself, the iPhone “ecosystem” as a whole does. It's a different thing to antitrust, though the more egregious offenders might also constitute monopolies for antitrust purposes. --- ¹: Perhaps relevant to the Y Combinator gang: https://www.cultofmac.com/743055/why-it-pays-for-startup-founders-to-use-imessage-blue-bubbles/ https://www.cultofmac.com/743055/why-it-pays-for-startup-fou... https://www.androidauthority.com/google-green-bubble-interview-3194383/ https://www.androidauthority.com/google-green-bubble-intervi... On Cory Doctorow's "competitive compatibility" / "adversarial interoperability" theme, a company called Sunbird Messaging claims to have made an iMessage clone for Android. It's proprietary, and might turn out to be vapourware, but I'm hopeful.