They give away their software but get a 30% on the software made by other companies and do their best not to let those companies get paid by other means than Apple's stores. I think this was the point of GP.
> "They give away their software but get a 30% on the software made by other companies"
Not on Mac they don't. macOS isn't tied to the App Store in the same way that iOS devices are, and it probably accounts for a tiny percentage of third-party Mac software sales by value.