What is the difference between this and a group chat? Most people have < 20 people that they know well enough to give a secret code to unless you're a creator or personality, in which care we are back to snapchat.

If the posts are more long form, what is the difference between this and a blog where the "secret code" is the URL?

Or even a finsta account currated the way you want.

I don't say these as a "it's not gonna work" as in consumer its about the experience, I genuinely wonder why the experience will be better