Probably because it is all portable and in markdown, the devs are widely available and it is open enough that community, open source plugins can be easily made which allow you to make custom workflows that simply aren't available in any alternatives.

Linking is significantly easier and better than any alternative I have tried which significantly lowers the effort of documentation which is the largest hurdle for most people. As all social media shit apps have taught us, ultra low-effort beginning of a habit is the key to consistent use.

And if the dev enshittifies, all of your notes are safe in plaintext markdown and not a proprietary format and can be imported and cleaned up in your choice of new editor and fix the linking.