According to my experience they aren't. I sent a massive burp to the group chat, saw some new "transcribe" option under the audio file, which I ignored. Later I

According to my experience they aren't. I sent a massive burp to the group chat, saw some new "transcribe" option under the audio file, which I ignored. Later I checked the chat and my buddy had "enabled transcriptions for this chat" and my audio file had "oh my god," I guess its transcription of my burp, as a caption.