[jeroenhd]

The thing about F-Droid is that you can add alternative repositories that allow you to host the APKs yourself without also writing an update mechanism. Hell, you can even get around the open source requirements F-Droid puts in place that way.

Every app store will try to get rid of applications that make the store's life harder, that's why the ability to add repositories is such an important (and underrated) feature.