Sometimes I’ll forget to turn off syncing to iCloud or Google photos and overall it would be much more reliable to me to be able to take a photo in an app I know nothing else has access to. Bitwarden premium has a vault I trust but no native photo app, same with Cryptomator.
I considered using a private Whatsapp group since Whatsapp does have a photo app but I still can’t bring myself to 100% trust their claim of E2E encryption.