While I'd like to, since I haven't gotten into the nitty-gritty, I don't want to name and shame based on presumptions, even if I have an isolated data point that supports them.

I would just say to be careful whose devices you use. Do your research and understand that you're implicating not just your privacy, but your physical security, when you put remotely-controllable locks, blinds, etc., in your home. That's a position of high trust, and most home automation providers (possibly including Nest, but they're by no means the worst) aren't worthy of it.