VideoLAN @videolan App Stores were a mistake. Currently, we cannot update VLC on Windows Store, and we cannot update VLC on Android Play Store, without reducing security or dropping a lot of users… For now, iOS App Store still allows us to ship for iOS9, but until when?
There’s plenty of examples of FOSS devs selling out to corps who dramatically change the apps they produced. Not saying that would happen to Fdroid, but ultimately, unless you yourself control the software and its updates, you can never be 100% sure.