This sounds like a click bait article intended to make people start complaining about 'big advertising' - with no real substance.
Yes subliminal suggestion works and smart speakers could be used to do it but subliminal advertising is illegal in most of the world (in the UK since the 1950s) and although there isn't direct legislation in the US it is effectively banned by precedent.
This isn't technically subliminal advertising though. Subliminal ads are just brief flashes that you're unaware of consciously, but still register on a subconscious level. If the consumer was awake presumably they'd be acutely aware of an advert playing because they'd hear it. The 'trick' is that the ad is played at when the person is asleep - other than that it's a normal (although presumably quiet) advert. It seems current laws would stop that.
subliminal ads are anything that your´ perceive (hear/see) but are not conscious of, hearing adverts while you are asleep - when you are not conscious are the same.
Subliminal: 1. inadequate to produce a sensation or a perception. 2 : existing or functioning below the threshold of consciousness
Yes subliminal suggestion works and smart speakers could be used to do it but subliminal advertising is illegal in most of the world (in the UK since the 1950s) and although there isn't direct legislation in the US it is effectively banned by precedent.
https://smallbusiness.chron.com/laws-subliminal-marketing-69...