I was un-pleasantly surprised with a change to ambient mode (some time within the last 24 hours). It seems they are adding advertisements to different things (Youtube (Fox business? Really? Not my style google), podcasts, etc.).
Steps to get rid of them (at least for now):
After talking with support I was assured the fix we did was the actual fix (who's to say for actual certain). We had found that if you turn off Voice Match in your Google Home app then it seemed to make them disappear. (Click on the device in Google Home App->Click settings gear on top right->Recognition & sharing-> Turn off voice match for this device (that was enough for me). Restarted the google TV and they were gone.
That isn't really an ambient mode at all.
Nazi propaganda forced on your TV, sweet moves google.