Sonos with "recycling mode": discount campaign makes loudspeakers unusable

Sonos is currently offering a discount for existing users. They will receive a 30 percent discount on the purchase of a new speaker. If you take advantage of this offer, you will destroy your old speakers for good.
A current discount campaign from Sonos went unbelievably in the pants. One would like to see the users of older devices on new speakers and is currently sending out emails about a discount campaign. This offers users a 30 percent discount when purchasing a new speaker. At first glance, this isn't a bad deal. However, if you take advantage of the offer, your old speakers will become unusable.
Recycling mode: Sonos speakers can only be used for 21 days
Specifically, users of a Sonos Play: 5 1st generation, Sonos Connect or Connect: Amp are currently informed of the discount by email.
If you follow the link in the email, log in with your Sonos account and claim the 30 percent discount, it's too late. A software update is loaded onto the speakers, which deletes all data on the speaker after 21 days and then deactivates itself. So there's no point in reselling it. After that, the only option is to recycle the speaker. In times of discussions and measures for environmental protection, this is of course a real disaster.
gegenüber The Verge it is argued that the ten-year-old devices do not optimally support the current Sonos software and therefore there is no question of reselling old devices. Nevertheless, this campaign did not do itself a favor. So rather not take advantage of the offer and either continue to use your devices or sell them - you have a lot more of them.