I didn't say that. I said "presumably their privacy policies would be different". If their service's privacy policy isn't materially different, then I wouldn't

I didn't say that. I said "presumably their privacy policies would be different". If their service's privacy policy isn't materially different, then I wouldn't trust it. If their service's privacy policy materially restricts how they can use the data in ways that Google's would otherwise allow, then I would put more trust in it.