"Recycle Mode is a state your device enters 21 days after recycling confirmation in the Sonos app. In Recycle Mode, all data is erased and the device is permanently deactivated so you can safely and securely dispose of it. Once a device is in Recycle Mode, it cannot be reactivated."

"In recent days, however, Sonos quietly removed the recycle mode option from its app, replacing it with a prompt to call customer service. Additionally, the company now says it's working on posting a new trade-in flow to its website, which will remove recycle mode from the process."

"Recycle Mode is a state your device enters 21 days after recycling confirmation in the Sonos app. In Recycle Mode, all data is erased and the device is permanently deactivated so you can safely and securely dispose of it. Once a device is in Recycle Mode, it cannot be reactivated."

"The reality is that these older products lack the processing power and memory to support modern Sonos experiences. Over time, technology will progress in ways these products are not able to accommodate. For some owners, these new features aren’t important. Accordingly, they may choose not to participate in the Trade Up program.

But for other owners, having modern Sonos devices capable of delivering these new experiences is important. So the Trade Up program is an affordable path for these owners to upgrade. For those that choose to trade-up to new products, we felt that the most responsible action was not to reintroduce them to new customers that may not have the context of them as 10+ year old products, and that also may not be able to deliver the Sonos experience they expected."

"A spokesperson for the home sound system maker told ZDNet that, "if a customer chooses not to acknowledge the privacy statement, the customer will not be able to update the software on their Sonos system, and over time the functionality of the product will decrease."

"The customer can choose to acknowledge the policy, or can accept that over time their product may cease to function," the spokesperson said.

"Sonos is a perfect illustration of how effective privacy, when it comes to not just services but also physical objects, requires more than just 'more transparency' -- it also requires choices and effective controls for users," said Joe Jerome, a policy analyst at the Center for Democracy & Technology.

"We're going to see this more and more where core services for things that people paid for are going to be conditioned on accepting ever-evolving privacy policies and terms of use," he said. "That's not going to be fair unless companies start providing users with meaningful choices and ensure that basic functionality continues if users say no to new terms."