I had a problem with my boss, sitting in the next office talking on the phone, not overly loud, so that I couldn’t understand what he was saying, just the ocassional word. He’d be talking away and saying “ok, ok. Ja, ok” and Google Assistant would trigger constantly.
I leave my phone on my desk when I’m out and about in the office. After a month, I checked my Google recordings, there were about 50 activations recorded, yet I hadn’t used Google Assistant once during that time! around 40 were my boss saying “ok, ok” and another 10 were strong wind triggering the assistant when I was out walking the dog!
As I don’t use the assistant, I’ve completely disabled the app on the phone - it is deactivated and doesn’t have permission to use the microphone, internet or storage etc.