Re: How many other renters complained and were ignored before it finally went public?
They'd be sued, and they'd lose. The general rule (at least in the US) is that video recording is OK as long as there isn't a reasonable expectation of privacy. It'd be hard to get a jury to agree that someone in a hotel room didn't have an expectation of privacy.
Many years ago I worked for a chain of casinos. They had cameras EVERYWHERE, except one place -- the bathrooms. We were forbidden by policy to position cameras so that they could even see inside a bathroom when the door was opened.
One odd bit of trivia -- recording AUDIO actually has stricter rules in many states, because it's covered by wiretapping law.