[jraph]

Open source / Free software comes with all the usual benefits:

- you can fork and adapt to your needs

- should the original authors stop developing it or take a direction you don't like but your started depending on it, someone can take over the development of a fork

- you can study how it works

- you can reuse some of the code to build an alternative product

- you can contribute patches if the project accepts them

- if you have to migrate, even if the format is specific, you can at least check how it works

That thing being open source is a big plus, and Obsidian using a standard format is a big plus.