I have no idea why Google doesn't get more flak, but there is a higher level of privacy standard with Apple as they neither profit from user metadata (advertising) and are the most publicly visible torch-bearer for privacy among the big corps.
I don't trust anyone (even Apple) to have an always-on listening device in my house. Too many shades of 1984. If need be, I'll push a button on my phone/bt headset and query.