Best answer by Insertusernamehere
^Do this, then block msmetrics.ws.sonos.com. Piehole is a good tool for this. Will also allow you to easily see what new addresses Sonos inevitably adds. Your router may also have a blacklist function. This will stop the collection of the data that appears in your Sonos profile and presumably the other functional data that Sonos does not allow you to opt out of (that they've been collecting on you forever and will keep as long as they want). Works well for me but YMMV.