Even owning Smart devices and having them always plugged in may potentially be a vector, Rob did a good breakdown on how this is achieved.

https://odysee.com/@RobBraxmanTech:6/radio:64

Did you know that your IOT devices are secretly communicating with each other? This includes IOT devices that are not in your home. Did you know that what your IOT devices do may be transmitted to third parties? Did you know that your TV may also have the capability and may currently be transmitting your activity far and wide?

There are secret communications occurring between IOT devices using protocols like Bluetooth LE, Zigbee, Thread, 802.15, and LoRa that you likely didn't expect or was not explained when you bought these devices.

Just like Amazon Echo has been conscripted to work with the Amazon Sidewalk Mesh network, other networks are in operation

If I did that half my neighbors would own my devices in a week because they like transmitting open access points for setup purposes. I just connect them anyway and then just block them from outbound access at the router if I want to restrict them. That way I can be sure. Then I can use my Homeassistant server to control them from behind the firewall locally if they have that capability.