A number of discussions and articles have popped up recently regarding whether or not people should disclose the presence of smart devices int heir homes to guests. Things like Google Home/Nest, Amazon Echo, etc.
The premise of the idea is that some people value their privacy a great deal, to the point of not ever having these devices. Just the same, some people don't use Google Chrome or whatever because they want to 'hide their data'. Which is FINE. To each their own. My personal opinion on data isn't important.
That said, you probably don't know all your friends opinions on data gathering devices.
1) Disclose presence of data devices in home to all guests, and let them decide what to do (Maybe offer to turn them off?)
2) Assume that anyone who has a problem with these devices is taking a risk of being recorded by going out of their own house.
3) Something else?
Personally, I never really thought about it. I don't care about having them in my home, but never considered what other people might think while staying there.