So, Sonos optionally lets you brick your own device, as part of their Trade Up program that gives a discount on your next device. It's named Recycle mode as, presumably, all the bricked devices are good for is recycling.
There doesn't seem to be anything stopping users from selling their speakers on - they just forgo the Trade Up discount.
The poster's point that this cuts down on re-use of perfectly good products is true, but it doesn't seem that much different to other trade in programs, e.g. Apple's. The difference seems to be that Sonos leave the burden of actually recycling the product (or not) to the user, while Apple does it for you.
There doesn't seem to be anything stopping users from selling their speakers on - they just forgo the Trade Up discount.
The poster's point that this cuts down on re-use of perfectly good products is true, but it doesn't seem that much different to other trade in programs, e.g. Apple's. The difference seems to be that Sonos leave the burden of actually recycling the product (or not) to the user, while Apple does it for you.