This - cathedral style development absolutely is a valid way to create free software and I don’t believe Eric S. Raymond (the guy who, I believe, coined the term) claimed otherwise, only that the bazaar model was “better.” Maintaining a bazaar style project is work, and it’s work that easily leads to burnout. We should normalize the idea that you don’t need to commit to being an “open source maintainer” to release a free software project; it should be enough to just release the source code (with or without binaries).
Supposedly the version on Github releases doesn’t have the Google libraries.
https://github.com/eszdman/PhotonCamera/issues/109
Still, I would wait until this app is in F-Droid before considering it. It includes some other libraries of unknown source.
https://github.com/eszdman/PhotonCamera/issues/46