Last week I attended a talk by one of the nuxt.js core devs, Sébastien Chopin. Nuxt, in case you haven't heard of it, is a framework built on Vue.js, with almost 100k weekly downloads on npm and 20k+ stars on Github. He said they have multiple sources of income, but donations and sponsors is just enough to cover hosting and offices. The team seem to get by on chômage (France's unemployment program, which is relatively generous... for a limited amount of time) and on some consulting work.

Maybe that's normal, but I hope that we can find more sustainable ways to develop great projects like this.