Mostly common sense. A stranger could walk their pet onto the property without permission. Is it the renter's job to run them off? If not, where is the line. There's clearly a grey area. The renter not allowing the visitor into the building (because the renter doesn't want pets) is reasonable. Preventing outside visitors? Grey area, and open to interpretation. I would consider it reasonable, and would push back if the landlord complained.

If you can't handle small violations, do not rent your home to a series of random strangers on the internet.

Certainly, but that doesn't justify spying on guests.

That's why I prefaced the statement with

>Obviously it doesn't apply here specifically

Like the Airbnb host, politicians aren’t going to surveil themselves.

Although the NSA could be monitoring and blackmailing the American political leadership…