Google is Killing Chromecast Audio for Some Reason - Thurrott.com
Chromecast Audio dongle has been discontinued. Found this to serve a Chromecast device with optical output. Just connect to a DAC then to an amp. You're good to go. : r/Chromecast
What Was Google Chromecast Audio and Why Was it Discontinued?
Chromecast Audio Is Being Discontinued, Google Confirms - Variety
Google is discontinuing the Chromecast Audio - Android Authority