They already tried to take a stab at Google, but they never took them on with a court case like this. Some are suggesting they should have taken Google on this way first, with a possible win making it easier to then take on Apple, but imo, they would have lost regardless.
Their case is stronger against apple.
On adroid phones, they get to try be their own storefront now (ei, not be on google store) and have to be installed as their own thing.
On iphones, there is no other option, effectively killing their ability to compete.
If they cant win against apple, they sure as hell cant win against google.