Because the language is so accessible and versatile. That also has some downsides, of course, as people have been hating on it since it started. But, as you'v

Because the language is so accessible and versatile. That also has some downsides, of course, as people have been hating on it since it started. But, as you've pointed out, it's hard to argue or dispute its dominance, so it must be doing something right. No language is perfect, they're all a series of tradeoffs that you have to discern, then decide on the best tool for the job. It appears accessibility goes a long way, and low barrier of entry to "make it your own" is worth something.