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Philips Hue will force users to upload their data to Hue cloud - Home Assistant
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
I feel that at the very least, the customer in that case should be entitled to a complete refund of the product, regardless of whether they bought it 5 days or 5 years ago and regardless of the condition their device is in.
This should at least give some incentive to companies to not perform such sweeping changes to their terms of service and if they do, the customer can more easily remove themselves from the lock-in without taking a financial hit.