Simple: most if not all JS frameworks are not profitable, so they are almost always driven by passion. (It will be much more expensive if you have to pay someon

Simple: most if not all JS frameworks are not profitable, so they are almost always driven by passion. (It will be much more expensive if you have to pay someone to write a JS framework for some weird reason.) That alone explains a proliferation of JS frameworks as the original comment questioned, while the number of different software licenses wouldn't be explained as such.