Google Play
Android's principal store — more open than the App Store, but in practice just as hard to avoid.
It began as Android Market in 2008 and was renamed in 2012. The difference from Apple is that Android permits other stores and direct installation of APK files, which F-Droid, the Samsung Galaxy Store and Epic all exploit. In practice Play still has overwhelming reach.
The real lock-in is not the store but Google Play Services: maps, push, sign-in and location are proprietary components absent from plain AOSP. That is what Huawei lost in 2019. Review is more automated than Apple's, which means faster publishing but also more cases of malicious apps slipping through.