If we're going to call a spade a spade, then let's go ahead and say that the majority of the packages that are always referenced in those discussions (is-even, is-odd, etc) is maintained and primarily used by a minority of developers that are very well known in the ecosystem.

This minority makes money out of their popularity in the NPM ecosystem. Having 1000 NPM packages is better for your reputation than having 100. And having all 1000 packages with lots of weekly downloads is better than having just a portion of that.

But how do they achieve that? Well, they have 1000 NPM packages, so each one depends on 5 to 10, that then depends on a few handful more. You have packages for checking if an HTTP status is a certain number, you have packages that have colors as constants, you have is-even, is-odd and so on. All that exists to maintain that closed ecosystem.

So out of the 1000 they basically have 20 useful tools and 980 garbage packages that exist only to maintain their own ecosystem.

Most people isn't using is-even or is-odd directly. They imported some other packages that are quite useful, but often need 10-20 sub-dependencies. Another interesting thing is that those shitty packages aren't really that important in applications. They're often used in build tools, CI and testing, tools for making CLI tools, and the sort.

The crazy thing is that a lot of people using is-even/is-odd aren't really "noobs": they're probably experienced developers that said "fuck it, I'll use some random tool from the web" when facing some random a problem.