I just to signup to say I would loved to have this one. Sorry @girish don't have the reputation yet to upvote but strangely enough I have enough to comment.
I saw Appflowy on github and tried it for a bit. The UI is very beautiful.
Just wondering if notion has a good data security?
I have all my doc stored on notion right now.
If it is not secure, I will switch to self-hosting note-taking app.