Out of curiosity, why is Obsidian closed source? It doesn't look like you charge for anything, and with the size and type of following you have, you'd probably see some really cool stuff get sent your way.
They seem to be particularly against it (https://forum.obsidian.md/t/open-sourcing-of-obsidian/1515/1...) which has always been my own worry about using this product. A knowledge base is something that takes a long time to start producing results and the idea of being locked into using a closed-source piece of software that I can't depend on being functional 5+ years from now is very scary. At least with open-source, a community project is likely to form a fork if the original maintainers disappear.
I realize they are just markdown files, but they use a proprietary "Obsidian" markup that will require painful conversion if I ever need move to another app. I've been through this before and it has always been a massive headache.
https://obsidian.md/pricing
https://obsidian.md/sync
https://obsidian.md/publish