If you sideload pirated copies of commercial games that are on the Quest store, that's forbidden. But sideloading 3rd-party apps is fine.
The "grey area" is modding games(notably Beat Saber), since it involves replacing the APK with an altered one without the consent of the developer. And if the developer sells DLC, that cuts into their profit and maybe they'll threaten to sue Facebook for damages since they created the development tools and authorized development accounts that allow people to do it.
The "grey area" is modding games(notably Beat Saber), since it involves replacing the APK with an altered one without the consent of the developer. And if the developer sells DLC, that cuts into their profit and maybe they'll threaten to sue Facebook for damages since they created the development tools and authorized development accounts that allow people to do it.