Did they really just pull a Unity move with charging per download??
This is not going to be good for any developers that sit in that danger zone of offering a free app with in-app purchases. If they don't make enough money (over €500k) once they hit that 1 million download threshold.. they could owe more money than they make.
Edit: Looks like the first million downloads are always free for that year, but anything after that and they start charging per download.
Still bad for free apps if they grow a lot without getting much income from their users.