It makes sense for apps which have a high ARPU. In gaming and related sectors, the number is notoriously low, even for large developers. The flow is new user installs app -> fraction keeps the app -> even smaller fraction pays. Typically even for a 10% paying users for an app like fortnite. Apple earns more with new terms compared to older terms.

I agree devs dont have to go for new terms and could stay with existing terms. The whole convoluted way of introducing this is meant to have that effect.