Cant see any of the notes because it wants me to login. As a third party why would I want to post on a platform that hides my content from every one that isn't

Cant see any of the notes because it wants me to login. As a third party why would I want to post on a platform that hides my content from every one that isn't in your walled garden? Why not just write on my wordpress blog and then post that on twitter like I have always been doing? I get the twitter audience and the non twitter audience.