I think the consensus agrees that sustaining open source software takes more than just money. And yet money often remains a crucial part of a larger need for open source to sustain AND thrive. So, if that's the case...how should you use funding for your open source project? Brenna Heaps writes on the Tidelift blog:
We’ve been speaking with a lot of open source maintainers about how to get paid and what that might mean for their project, and the same question keeps popping up: What do I do with the money?
Fund the project, community engagement, and pay it forward...
But, it's a short read and worth it — so go read this and then share it with your fellow maintainers.