Also, more generally, any software that has unique features will require "the annoying process of fixing them and getting it working in whatever new system I switch to when I leave", whether it's open source or not. So you're not actually looking for open source, you're just looking for something with perfect feature parity to another program.
From the docs:
> The Obsidian team is small and unable to manually review every new release of community plugins. Instead, we rely on the help of the community to identify and report issues with plugins.
https://github.com/obsidianmd/obsidian-help/blob/master/en/E...
What, no smiley face in those comments? Maybe a silly shrug would have been appropriate.
See also: https://stephango.com/self-guarantee
And yet, I'd wager my life savings that almost no one using open source software actually verifies that it's not malicious in a different way than one would closed source software (ie. reputation), and instead almost everyone just trusts it.