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Home Assistant officially Matters
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first.
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Besides that, Thread is pretty low-bandwidth and low-noise. It's designed to sip battery life from devices.
2.4Ghz just allows it to be built into tons of devices without an extra chip. Every Google Hub, Alexa, or Apple hub supports it.
Every Google, Alexa and Apple hub support 2.4Ghz Wifi and likely can be a Matter controllers, however only a subset of them support Thread.