Every single app you've ever downloaded basically shares this same property. You either audited the code and know what it does or you are taking someone's word for it.
Like other commenter referenced, the markdown-oxide LSP replicates the core of obsidian better than obsidian does. I use it with helix. I described by setup in more detail above: https://news.ycombinator.com/item?id=48180639
I recommend the helix text editor with the markdown-oxide LSP (and rumdl formatter if you feel fancy). All open source and even if you never update them they will work forever.
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