If you mean who gets the money from app purchases etc.; The ruling also says Google play billing cannot be required, so each app/developer can use whatever payment processor they want

Reading this, it’s my understanding this ruling says Google must host rival “app store” apps in Google play store and must provide them with a copy of all apps on the playstore for them to distribute. Developers do not opt in to the new app-stores, but they can opt out.

actually yes, there have been alot of games in the rpgmmo ish game like genshin and the ark / survival builder games like Palworld.

Whenever a game becomes popular people and studios try to make thier own. Palworld is an example of one that worked (it being Ark survival evolved: pokemon editon)