It seems the developers sold or lost control of Camera+ One of them was tweeting about the new app Photon which seems made by the same developer.
https://photon.cam/
Since there is no transparency about who is supporting either, what happened I could not recommend either to anyone. If you hide the identity of owners, founders, developer, product people and don’t engage with your users it’s easy to walk away.
On twitter he was promoting Photon when I asked why a new app you had to buy to get this new vision for photography this was the reply
Antonio Cabezuelo Vivo # @acvivo• 15h
While Camera+ is no longer under our ownership, we remain committed to our mission of providing photography enthusiasts with the best tools possible.