Hi, missing a lot of history here. When Chalk was written, colors in the terminal wasn't a flashy thing people tried to do very often, at least not in the JS world. Coming from browsers and wanting to make CLI apps using the flashy new Node.js 0.10/0.12 at the time saw a lot of designers and other aesthetically-oriented folks with it. Chalk filled a hole for people to do that without needing to understand how TTYs worked.
Node.js proper has floated the idea of including chalk into the standard libraries, FWIW.