EU: "You can't force all developers to give you money"

: "It's for the safety of users"
EU: "It has nothing to do with safety"

: "Ok, we'll get rid of safety requirements but we still want a lot of money"
EU: "You think this is a joke?"

: "Ok, a little less money"
EU: "Dude..."
By the time Apple actually complies and gives iPhone users who paid hundreds of dollars for their phones the ability to install what they want and pay how they want, they'll have squeezed so much money out of the market that no fine could possibly take back a relevant percentage of what has been extorted through the years.