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ESP32-C3 does not have zigbee/thread capabilities, only the upcoming C6 and H2 have it.

They do have example Matter projects for the ESP32-C3/S3. I assume it's over WiFi and not thread.

Why should it? It is neither talking about Zigbee specifically for example.

Well, it seems pretty comprehensive, and includes home automation. And Matter/Thread is what all the cool kids are using.