I'm not sure about the what advantages the MIT license has over your one-liner, but some people (eg Stallman) believe in using more restrictive mechanisms like

I'm not sure about the what advantages the MIT license has over your one-liner, but some people (eg Stallman) believe in using more restrictive mechanisms like https://en.m.wikipedia.org/wiki/Copyleft https://en.m.wikipedia.org/wiki/Copyleft, and your one-liner is inadequate for them