[lioeters]

> One day, I updated the app and all my local data was uploaded to the cloud

This happened to me with Chrome. It auto-updated, then automatically synced browser history, passwords, and who knows what else, to Google. They soon changed it to opt-in sync, but it was too late for me at that point; they had already hoovered up my personal data. That was when I stopped using Chrome and switched fully to Firefox.