The only “google” thing in my home is a nest. That’s only because G acquired the company years back. Only thing they added was forcing users to migrate Nest account to G.
Honestly might disconnect the nest from the network. But only keep it connected and segmented from rest of network for remotely changing the temp from my phone.
One of these days I’ll “hack” (explore) the device so it doesn’t rely on Nest/Google APIs. There’s absolutely no reason why I need a Google auth token to access the Nest other than for Google to collect whatever data and feed to their beast