The legal issue seems to stem from a few Sonos patents: https://www.theverge.com/platform/amp/2021/8/13/22623977/sonos-google-patent-lawsuit-itc-judge-initial-

The legal issue seems to stem from a few Sonos patents: https://www.theverge.com/platform/amp/2021/8/13/22623977/sonos-google-patent-lawsuit-itc-judge-initial-ruling-infringement https://www.theverge.com/platform/amp/2021/8/13/22623977/son... For example, Sonos has patented "Method and apparatus for adjusting volume levels in a multi-zone system" and the patent shows an app where you can set volume levels for connected devices: https://patents.google.com/patent/US8588949B2/en https://patents.google.com/patent/US8588949B2/en