Comment by phpisthebest

You have confused transport encryption with storage encryption

Google and Nest use transport encryption to ensure only the device and google can see the data, but once it stored google can see everything

Zero knowledge data Encryption would require that ONLY the owner of the device has access to the data, not google

and example of this is say BitWarden Password Manager, even though the data is stored on BitWarden Servers, No one at bitwarden as access to any users password vault, The user holds the key, and only the user can view the passwords.