In the 2009 Oscar-snubbed masterpiece Monsters vs Aliens, the alien mothership is defeated by a half-man, half-cockroach scientist doing DDR.

https://youtu.be/s7HirhI6Wjc

In my (non-expert) opinion, there are a few reasons

1. NPM is more popular than those other services by an order of magnitude, especially among new developer and startups.
2. NPM allows for code to be executed while you install the package which is different from maven or nuget and allows for easy exploitation paths