https://www.cnbc.com/2018/07/10/sonos-ipo-reveals-amazons-incredible-leverage-over-speaker-maker.html

Sonos, the maker of wireless and voice-recognition speakers, may seem to a casual observer to be in the prime position to ride the surging smart speaker trend.

But the Sonos’ initial public offering document revealed a critical flaw in its business model, which subjects it to Amazon’s whims on what the internet giant decides to do with its Alexa voice-recognition technology.