The law is intended to extinguish developer agreements that ban software creators from informing customers that they can get a better deal by initiating payments elsewhere, or by getting a service through the web instead of via an app.
In response, Apple, has instituted a #JunkFee it calls the "#CoreTechnologyFee": EUR0.50/install for every installation over 1m. As Proton writes, as apps grow more popular, using third-party payment systems will grow less attractive.
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