I work for an un-named company that makes stuff that has google assistant on them. Initially we put hardware mutes and piped the microphones to physical hardware that monitored for wake up words locally and would then start piping the microphone data to the mother ship once it was heard. Google told us to stop that, only way to certify the product as compatible with Google Assistant was to pipe the raw microphone data to the mother ship 24/7. That was 5 years ago and I removed all devices from my house.

I just ditched my nest camera after 6ish years. Fuck the spys