What dark patterns is the Pixel Camera app using, or what bad things is it doing with my data? In what way is my camera app infringing on my freedom? "It was written by company X I don't like" is not an answer - why should I replace my camera app specifically?
One negative of the Pixel camera app is that it forces Google Photos as the gallery app, even if Google Photos is disabled or not installed on the phone. I think there is a third-party shim app that essentially redirects requests to Google Photos towards whatever gallery app is set as default, but that should not be necessary.