It appears that has unwittingly added some magic to the Live Caption feature found on some Pixel models. With Live Caption, users get to see subtitles on the screen, even with live content (hence the name of the feature). It was included with the release of Android 10 and is turned on with a press of the volume rocker. On the bottom of the screen you'll see an on/off button that includes the message "Captions appear when speech is detected."
Not everyone wants to use Live Caption. Some streaming apps have their own closed caption option that works better than Live ...