They let developers choose more price points. They offer only a 15% cut of subscriptions in a number of circumstances instead of always taking 30%. IAPs and subscriptions have given developers more choices of how to monetize their apps.
At no point did they ever use their position to squeeze more money from developers. Even the yearly developer fee is still $99 despite the HUGE increase in App Store revenue.
It’s understandable people want Apple’s cut to shrink, but that doesn’t appear to be legally required. They didn’t make things worse so it seems they’re in the clear.
(They still lost on the alternate payment method thing)