Cellular Home Automation
You don't need to share you WiFi key if you use a cellular ZigBee system; see IoT-Portal Hub
Why is that a problem anyway? I don't think your WiFi signal stretches to China. I think your biggest problem will be it stretching to all the rooms in your house.
I also don't think your £2 smart light bulb really has the processing capacity to create a sophisticated router which can hack into your Windows 11 PC. Maybe if you're still on Windows 98 you might get the Chernobyl virus but I'm not really seeing the issue.
Biting the hand that feeds IT
