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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 was always skeptical of Philips Hue because they seemed shy about using local only or even the fact that they're just zigbee bulbs in their marketing. I ended up going with Sengled zigbee bulbs for myself, but I've always heard that Hue bulbs have the best brightness consistency and color. Also been noticing lately that the smart bulb market has been flooded with WiFi and Bluetooth bulbs, and there really isn't a lot of choice left in the zigbee/local only market. Hopefully this change by Philips doesn't lead to them dropping zigbee compatibility in future products, but them making moves like this doesn't give me much faith.
I think the zigbee is part of their renowned reliability. Hopefully that’s true.
This is my chief worry with Thread. Zigbee is guaranteed to be local only, but if they switch over to Thread, the individual bulbs will be able to call home, even if they expose some of their functionality locally via Matter. With home assistant, one can probably configure their Thread Border Router to not allow internet access, but I have a suspicion a lot of supposedly local thread/matter devices will be designed with the assumption that they have cloud access and won't function fully if firewalled.