It's high - but it's not that crazy.

Assuming this doesn't count updates - the service is probably costing Apple €0.10 on average. Apple has a very hefty margin on everything it sells.

If each update costs €0.5 - I suspect this is going to lead to a massive decline in European apps. That's simply too expensive for almost every app.

There's probably less than 1000 apps this would make any material money off of.

This is just another way for Apple to try to tax Facebook, Google, and a handful of other big apps.