The issue of whether there is a generalized sustainability crisis in open source is a contentious one, but that doesn’t obviate the need to find a solution for open source projects that do struggle to find funding and volunteers to support development. Whether these are marginal examples or a rising epidemic, the fact that they continue to work on open source projects in spite of this shortcoming is a testament to their dedication to the goals of the project and open source development more generally. Yet most developers are in agreement that if there are ways to sustainably fund the open source community, this will ultimately lead to even better software.

https://motherboard.vice.com/en_us/article/43zak3/the-internet-was-built-on-the-free-labor-of-open-source-developers-is-that-sustainable