And especially awesome is that all their enhancements like properties and daily notes make use of markdown or json rather than closed binary/hard to reverse xml formats. Any app could replicate the functionality if it wanted to and it would be portable next minute. The only thing that is kind of locked is the plugin but that’s outside of scope.

Exactly this. I don’t really care if google drive or Dropbox is closed source. Why would I? I’ll just use syncthing (open sourced alternative) if shit hits the fan. Let them earn their money by providing bandwidth, safe storage and file versioning.