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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
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.