Yeah, this. There is, technically, nothing illegal about the practice as described (unless they're actually placing fake 911 calls, but that does not seem to be the case here), it's just pretty doggone unethical, and in the end, counter-productive once word gets out that they're doing it, as people are going to start refusing access even when a legit 911 was made.
That’s probably why the sheriff is putting an end to it.