This is just textbook rent-seeking.
Like the classic example is someone setting up a barrier on the river and charging boats that want to pass through. There's no value being added by the person blocking the river.
Just the same, when Apple says "Let's charge for this", what value are they adding for doing so? They make money off the current system. They just want to make more money while providing zero additional value to consumers or to app makers.
All I can ask is "How do you sleep at night?" but I'm sure I'll get the Rainier Wolfcastle's answer.[0]