My interpretation is that the idea is that third-party app stores could, for example, support updating an app installed by another app store.
Instead I would rather let 3rd parties provide different UI for Google’s App Store backend for a small cut of any transaction. Minor improvements like being able to permanently block any idle games, IAP, advertisements, etc would go a long way. But frankly Epic doesn’t give a shit about users here.
Or perhaps they do hand out your app at a discount, and then never pay you. Or, do several things all at the same time.
"Looking"? AFAIK one can't update an app that had already been installed with a different signature. Correct me if I'm wrong and that's not the current behavior on Android.