I previously asked about what you can do if Alexa is triggered by a television programme, but recently I realised something strange: The Echo does not respond to the voices in adverts for the Echo, even if voices say "Alexa, play ..." or "Alexa, set a timer for ...".
I searched on a few other Echo communities, and found a Reddit post that suggests that this is common/intended behaviour. There isn't a definitive answer in the thread, though, so I thought I would ask here to see if someone knows a little bit more.
How does my Echo know not to answer to a TV advert? Is it just a co-incidence or is there something that tells Alexa not to react?