I recently purchased a Roku TV for the guest room, hooked it up to the guest wi-fi (I created a separate user profile from my own for security reasons), set up the Roku guest profile (lets you choose login/logout dates) and since I always check the TV, I can set it up for the next guest’s visit and it automatically logs them off the morning they leave.
So far, everyone has liked that they can do their own thing with their accounts and know that they’re logged out that morning (several have checked).
It gives everyone peace of mind and I don’t have to worry about Alexa. Mostly because I won’t have a (well, another) tiny surveillance device in my home.