I also used to think that build it and they will come was a big fallacy, but it's not really. The fallacy is, "build it and the whole world will fight to get what you built". That sure won't happen by itself or by chance.
But if you build something reasonably good, some people will come. That may not be enough for you to make a living out of it, but it will make it worthwhile.
> Learning things is valuable in itself.
From the same author:
> Open source, writing blog posts, and playing with tweaking lint settings and editor themes all day are completely fine until your landlord knocks on your door or you're at the checkout at the grocery store. You're doing a crazy 2-hour commute every day telling yourself "well at least I'm learning a lot about SVG". Fuck that.
https://kitze.io/posts/github-stars-wont-pay-your-rent
(I am actually, currently learning a lot about SVG and love it; but the quote is right that it's not paying the rent.)