Is it clear in the ruling whether developers can use secondary payment as the ONLY payment method? Or will they have to still provide payment via Apple as an option?This is what App store revenues look like for the last few years. Apple's cut of 15-30% of in-app purchases will be diminished. This adds up to tens of billions of dollars over the foreseeable future.
https://www.statista.com/statistics/296226/annual-apple-app-store-revenue/
It's not the lazy users that drive change, but the sea of developers that will fight for every penny of their hard earned money.
I feel enough users would prefer Apple payment due to convenience, that most would need to provide both, which in turn lessens the incentive to have the secondary in the first place… I see a catch 22 for the developers there. If both options are available, noone will pick the alternative method unless it costs less. If it costs less, the developer earns the same, AND now has the cost of the secondary payment method. So in practice, not much difference. This goes for micro transactions, perscriptions will benefit more.