In many cases in the U.S., Instrument Approach systems are remotely monitored (via computer systems) at a regional office, which will call the affected ATC facilities should a fault be noted. While we have ILS monitors in our Tower cab, they are also remotely monitored from the same office. We have a satellite field with ILS, several NDBs, and the area VOR which are not monitored at all from my facility, but from said regional office. In absense of a phone call, or report from pilot that facility ID is missing, we run approaches to those satellite airports. In VMC wx, it is not unusual at all to see several VFR targets flying practice approaches to same without communicating with ATC. I'm sure they are, (or SHOULD) be communicating on the common traffic advisory frequency (CTAF) however.
Been that way over here for decades. I was doing same in the early '70s while working on my Instrument rating.
