Jesus almighty that is a lot of licenses. No wonder MIT has just become the unquestioned default.
This is a specific thing per ecosystem/community. Some use a lot of MIT, some Apache, some BSD, some LGPL, some Boost and so on.
I suspect a lot of this is due to the viral nature of licenses. What license is compatible with MIT? MIT obviously, so let's just choose that :)
https://news.ycombinator.com/newsguidelines.html
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...