Simple Mobile apps have been very popular among FOSS enthusiasts. I've personally been using the Gallery, Contacts and the Phone app since a few years now. It's a shame that it has come to this, will be on the lookout for their forks.
Thankfully I only have them via Obtainium. Flip the "track only" option to on and wait and see. Like someone else said, I'm hopeful there'll be forks for these soon enough. I'm off to fork the repos for myself anyway, just in case.
Edit: for those that are self-hosting some form of git, is would be great if more people did this, for archival purposes. I've simply left the public fork of all 19 repos in my Github account, but have mirrored those to my private Forgejo instance.
At any point I can sync the GH forks then mirror those down to my local instance. Until the original repos get dismantled, of course.