It's for video game. It's easier to align stuff on the screen when every character has a fixed width. For example, with courier fonts.
But the could also also be some advantage to have the height match the width of the characters. But I am not sure if such fonts actually exist without making my own. And if they do, how are they called? That would make searching easier.
Square fonts seems to be somewhat related.
They are pretty rare, so either I'll have to design my own fonts, or edit fonts to stretch them accurately.
I guess I'll eventually need to learn font editing, unless I do them bit by bit(pixel fonts). But I would only do that with low res fonts.