At least coinbase claims they keys remain on your device: https://help.coinbase.com/en/wallet/getting-started/what-s-the-difference-between-coinbase-com-and-wa

At least coinbase claims they keys remain on your device: https://help.coinbase.com/en/wallet/getting-started/what-s-the-difference-between-coinbase-com-and-wallet https://help.coinbase.com/en/wallet/getting-started/what-s-t... Do you have reason to believe this is not the case? Or are you more concerned about a malicious update to the app?