There are countless ways one can be forced to use an app. My employer could require it. My bank could switch to their own system from Apple Pay. The public tran

There are countless ways one can be forced to use an app. My employer could require it. My bank could switch to their own system from Apple Pay. The public transport in my region could roll their own tracking ticket system instead of using Apple Pay. An app leaving the App Store could just have no viable alternative. Etc.