No, Google is being fined for taking advantage of a bug in Apple's software to make money, rather than reporting the issue to Apple so they could fix it. Heck, there's even a menu item in Safari to "Report bugs to Apple..." You seem to be blaming the victim for the poor choices of the person taking advantage of them - if someone accidentally leaves a window unlocked that doesn't translate into a right to burgle the house.
Unethical is one way to describe Google's behavior. Another way to describe it is criminal, as clearly Google was obtaining unauthorized access to a computer. You know, the sort of thing that gets people time in prison.
That's a problem with corporate law - companies have all the rights of people, but only one real responsibility - to make money. Minor fines for major infractions do not deter criminal behavior.