I have a doubt here, these apps from fossify are actually forks from the original open-source repo.
Now, say the original repo is closed. Would fossify face some restrictions. Because the base code is actually from the repo will be owned by closed person.
any code added to the repo from now on can be closed sourced but any code from before the purchase will always remain open source so the base code that the new apps are using will always remain open source and cannot be closed and any deviation will have to occur from now on.
Edit: the F-Droid team has also halted all new versions of the base apps since they no longer comply and they will eventually be out of date and removed.