That's a good reason why fines (like what Google is getting) should be huge.
It's deliberate to kill competition while not being in a dominant position, and then when in a dominant position, continue the trajectory by defining defaults.
The Apple apps are dominant partially because of the abusive rules the app store had earlier. It's quite clear from the fact that in any area where Apple did not have a default app, they are unable to match what the free market offers.
