Epic is a developer of entertainment software, including Fortnite. The public reasons say Google removed Fortnite from the Play Store on 13 August 2020, and that step provoked the litigation against Google. Epic's complaint was not simply that Google operated a successful app store. Its case was that Android, while open in theory, had been structured so that realistic large-scale distribution outside the Play Store was much harder in practice.
The reasons describe Android as a multi-sided ecosystem involving users, OEMs, carriers, developers and Google. Google made Android OS available under an open source licence through the Android Open Source Project. But the reasons also explain that open source Android did not include Google Mobile Services, or GMS, which included important Google apps and software tools. A device without GMS was described as functionally limited because many non-iOS apps were built using GMS APIs or SDKs and would only run as intended on devices with GMS installed.
That commercial reality mattered because OEMs wanting to distribute devices with GMS pre-installed had to enter into a MADA with Google. According to the public reasons, the MADA required pre-installation of certain Google apps including the Play Store, required those apps to be placed in specified prominent locations, imposed technical requirements, and required ongoing compliance with the Android Compatibility Commitment. The ACC, operating with the MADA, in general terms prevented OEMs that wanted to distribute devices with GMS Android pre-installed from also distributing devices running Android forks.
The reasons explain Google's position that anti-fragmentation and compatibility arrangements addressed the risk of device fragmentation and helped ensure a consistent experience for developers and users. Epic's case, however, was that these arrangements also helped preserve Google's control over Android app distribution. Epic further alleged that Google reinforced that position through incentive arrangements with OEMs and major developers, including revenue sharing and programs referred to in the reasons as RSA3s, MIAs, GVP and AVP.
On the developer side, Epic challenged the terms required to access the Play Store. The reasons say developers could not distribute through the Play Store without entering into a developer distribution agreement on essentially non-negotiable terms. Under that agreement, developers were prohibited from distributing rival app stores or apps that distribute other apps through the Play Store. Developers monetising Play Store apps through in-app purchases of digital content were required to use Google Play Billing, subject to limited exceptions. The agreement also included an anti-steering rule, so developers could not lead users from a Play Store app to another payment method.
Epic also relied on the practical difficulty of distributing apps outside the Play Store. The reasons state that in Australia during 2020, less than 3% of new apps downloaded to Android devices were directly downloaded or downloaded from an app store that was itself directly downloaded. The reasons identify three major barriers to direct downloading: discoverability, extra steps and warnings in the sideloading process, and functional limits around updates, at least until Android 12 changes in October 2021. Epic's point was that alternatives existed in theory, but not as realistic substitutes at scale.