When it's hot, I put a window fan in my bedroom in the evenings. I have it plugged into a smart switch. The google routine turns it off around 2am automatically. I sometimes adjust the time depending on season.
I haven't rewired the light switches in the house because it's not that important to me, but it would be nice to be able to say "hey google, turn off all the lights" when I go out instead of running around flipping switches.
I honestly don't care if someone in China knows if my lights are on.
What about someone in China using your devices as part of their botnet to DDoS someone?