Individually, pushing back on such terms and having a strong alternative. "subtract the cost of the oven and leave the spot empty".

Collectively, through market leveling regulation. "Selling" a device where the manufacturer retains control after the transaction is straightforwardly in the category of fraud. But unfortunately we seem to need new laws rather than relying on straightforward torts.

Furthermore, reigning in the surveillance industry with a US GDPR would go a long way towards removing the incentives for this bullshit.