Since the very first spy satellites were placed into orbit, adversaries have carefully tracked their orbits so that they could avoid exposure during an overpass. This form of cat and mouse game has had various options thrown at it, from satellites that can change their orbits, to "cover" satellites which operate as one thing and provide surveillance capability in addition to their "public" persona.
SpaceX threw up 2 satellites on a ship that was carrying 60 separate satellites (the others being Starlink nodes). But it could throw up 60 black sky satellites if asked. Further it could do that fairly quickly[1] from time to request to launch using a flight proven booster. Or perhaps 30 satellites with their own booster engine to maximize the number of orbits they could reach.
At some point continuous monitoring of a point on Earth becomes simply a question of cost. That can be kind of game changing from a geopolitical perspective.
[1] Where quickly here is anywhere from 10 to 60 days depending on whether or not a company like black sky could have the upper stage on hand with the delivery system.