Not sure. If the government is doing something large-scale in public (like construction projects [or maybe global IP routing]), they should communicate what is happening before doing it, in order to not phase people.
(Also, sorry to be That Guy, but this one always gets to me: in the sense you've used it, it's "faze", not "phase".)
It's the same problem as FAANG collecting mountains of "anonymous" metrics. Pretty soon, you can determine who the "anonymous" user is.
We had to run the whole project on a completely separate network from the rest of the business due to the classification of the software, which was driven entirely by a handful of frequencies used in testing; details of which were also broadly available from OSINT sources.