Obsidian Portal is not even in the same realm as Obsidian.md. Especially with all this OGL concern floating around.
If you want to see what Obsidian.md can do
WATCH THIS. It really is imo the only tool I've come across that could do what Realm Works does and has since grown significantly to provide way more functionality than RW in a local and easy data structure.
Example: We used to talk about how nice it would be if you could have calculations in your notes within Realm Works. Some sort of maths feature. Well Obsidian can absolutely do that. Imagine having location notes that automatically calculate travel time to the next town!
It exists already