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Matter 1.3 is here to help get your smart home energy usage under control
(www.androidpolice.com)
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
The whole point of matter is that it’s local-only control
if not locked in a cloud service....
https://www.googlenestcommunity.com/t5/Apps-Account/LAN-mode-support-on-Google-Home-app-for-Matter-accessories-is-mandatory/m-p/456539