I find the group think here to be incredible, and you all will likely be very disappointed when the legal system winds up supporting Apple. Regulating retailers because you don’t like their cut is price controls, which is completely contrary to a free market, and ultimately undermines the end user experience of having a trusted, secure store. Perhaps Google or Apple’s power is so strong as to warrant regulation - but…
I personally don't think 30% is particularly high in normal app selling scenarios. The two bigger issues with Apple's system are 1. The complete control over the ecosystem, which is gated and opaque. No alternatives to bypass the App Store. 2. 30% is fine for single app sales, but when you're an app that sells monthly subscriptions or tons of in-game content, it just doesn't scale the same.
For subscriptions, Apple changed the rules a few years ago to only take a 15% cut of renewals after 12 months.