The EU is not going to force this, because it has enough fights to pick with the US, and this is not the hill that they are willing to die on. It would be far more likely for them to financially support an AOSP-based OS.
Google lost all three cases. The DOJ in all three recommended the company be broken up, but the judges disagreed. If you want to blame someone, then blame the judges, not the current admin or Bidens DOJ - both of whom said Google should be broken up.
Anyway, I am going to stop here, since this will probably derail in a non-productive political discussion otherwise.