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.