According to the twitter thread their ``recycle mode'' works by blacklisting the device's serial number in the mfg's database to prevent it from working, so depending on what you want to do with them they might be perfectly functional.
That really says a lot. I've seen plenty of companies who would have to tell you tough luck, no exceptions if you have a device which is "accidentally" on like a stolen blacklist (take iCloud activation lock for example), since if they have the ability to ever bend the rules, it'll be exploited by thieves -- but the funny part here is that 100% of the devices in "recycled" status are just there because Sonos gave someone a coupon, so the only "reason" for a zero-tolerance policy against reactivation in any circumstances is revenue protection.
