You don't understand the term "rent seeking". Because in this case, it's Apple's competitors that are rent seeking by utilizing the force of the government to make Apple give competitors access to its private but non-monopolistic ecosystem.
I think that Apple should call that bluff and leave the EU.
Which in turn will increase public pressure on the EU, but not as functionally as it would in a democratic system.
All hollow talk. It will lose all of its aggression the moment that Apple leaves the EU, and EU citizens are left with the remaining options.