Sonos doesn't take back the used devices: they expect users to give them to a local electronics recycler for recycling, where they essentially have to be scrap

Sonos doesn't take back the used devices: they expect users to give them to a local electronics recycler for recycling, where they essentially have to be scrapped, because devices in "recycle mode" are blacklisted in Sonos's servers and can't be resold (even if they're in perfect working order).