They can technically store, but not always legally, since storage may be in violation of their privacy policy. For example, Apple won't store the audio, unless

They can technically store, but not always legally, since storage may be in violation of their privacy policy. For example, Apple won't store the audio, unless you opt in [1]. [1] https://www.apple.com/legal/privacy/data/en/ask-siri-dictation/#:~:text=Unless%20you%20opt%20in%20to,may%20be%20stored%20by%20Apple. https://www.apple.com/legal/privacy/data/en/ask-siri-dictati...