Because it's not Free Software™.
https://www.osweekly.com/free-software-vs-open-source-why-th...
You're right, open source and free software are not the same thing, but software licenced under the MIT licence is still free software. Even the FSF describes the MIT licence as a free software licence (see my other reply in this thread).
alt Hacker News
You're right, open source and free software are not the same thing, but software licenced under the MIT licence is still free software. Even the FSF describes the MIT licence as a free software licence (see my other reply in this thread).