I wondered why the Amiga specifically, but the article talks about that:

> What makes the Amiga particularly suitable for creating text art, however, is its default monospaced font "Topaz". Its letterforms and column settings allow for the creation of cohesive patterns. In Amiga, the line spacing and character spacing are very narrow, so certain characters "merge" if arranged correctly. For example, by typing an underscore followed immediately by a slash, it looks as if these two characters were one cohesive pattern and not two separate characters.

...and yeah, looking at some examples[1] I can see why the Amiga got its reputation and style.

[1]: https://blog.glyphdrawing.club/assets/qzXH73V-55-749.png