system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Why wasn't the magic used in making the Maruader's map expanded upon? Make a mass grid of map that can keep tab on the whole wizarding world?

So it kinda bugs me that the Maruader's map reveals everyone in their true form (such as Pettigrew) yet it wasn't a widespread form of magic. Why don't we see basically EVERYONE have their own map? Can't be that hard to make right? It seems like something one should keep to know everything about where someone is. I could see Death Eaters having them, or maybe utilize it in fighting Voldemort, knowing their next step. Basically it's like Google earth but you can see person, who WOULDN'T find that useful? 

So my question is why wasn't the map expanded to form sort of like a network that lets you spy on EVERYONE? Kinda like that cell surveillance thing from Dark Knight that Lucius fox makes.
gpt
It is possible that it was tied directly to the magical flows of energy that go through Hogwarts. Like... imagine that it was using Hogwarts' own internal security spells and charms to get the information it needed. The map is useful, but unless many other witches and wizards hadn't been building the detection charms and spells over centuries, it wouldn't be possible to use.