In this blog post, Google said that they "recently implemented features in Android 14 that will make third-party app stores work even better for users and let third-party app stores update apps more easily."
https://web.archive.org/web/20231219223159/https://blog.google/outreach-initiatives/public-policy/reaffirming-choice-and-openness-on-android-and-google-play/
Growing our commitment to app store choice: We have always allowed alternative app stores to be preloaded onto Android devices and for users to download alternative app stores directly. In fact, most Android devices ship with two or more app stores preloaded. The settlement with the attorneys general makes clear that OEMs can continue to provide users with options out of the box to use Play or another app store. We recently implemented features in Android 14 that will make third-party app stores work even better for users and let third-party app stores update apps more easily.
Does someone know what features Google is talking about? Android users have been able to sideload apps using third party sources for a long time.