Years ago somebody marketed a device which detected the increase in volume on TV adverts and muted the sound and the TV during the commercial breaks. The version of the story I heard was that this was so successful that the advertisers had to reduce their levels somewhat to thwart the ad-killer. I don't know what the position is now - of course if advert killing became too universally easy to do, nobody would pay to advertise and there wouldn't be any TV.

Not that I can see any problem with that.
I never watch it anyway.

BTW - compression on live sound - certainly used, typically per channel to tame poor vocalist mic technique, and across the main output to protect the speakers from damage by unexpected peaks, but can't be done too much or you get feedback howls.

Anahata