I guess this isn't much different to any other remote conference in that regard - any thoughts on how to use this in a polite and safe way? Or is the idea it's really for use in a private environment only, like your home? That is implied in some of the intro material.
Basically, what are etiquette considerations or issues for other people who aren't involved in the session? Just don't use it in that context?
Secondly, how have you handled the unusual nature of this compared to normal conferencing - where you are directly and continuously interacting with the other person, rather than having them quietly watching over your shoulder as in this case? There are obviously quite concerning potential privacy issues here as well.