

It’s regrettable that Obsidian isn’t open source. But the nice thing about it is that its data store is just a bunch of markdown files in a folder structure, and very easily migrated to any other application. They may have the code but they don’t take the data hostage like a lot of commercial software does.
I have never seen this happen, and I don’t know what tools would confuse the strings “null” or “Null” with NULL. From the comments in this thread, there are evidently more terribly programmed systems than I imagined.