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That really sucks. You were just doing your usual stuffs and some people out there are going their ways just to do this kind of stuff. This is why I do not trust a lot of hotels these days and that is why I never attempt to reside in one. Sure it is your room temporarily, but who knows what is always laying behind the walls, ventilations, etc.
I even recall some people claiming that there are even hotels that have two-way mirrors. My findings might not be crypto-related, but it is a worth taking note of it considering that we're also talking about the common privacy we should have.