All this is is a presentation with a boatload of text and absolutely NO indication of what the app looks like or how you go about using it.

Even before i saw the note about the security issues i wouldn't click on try because why should i invest my time in trying it. I have no clue what it does beyond saving markdown files to github. I've got plenty of markdown apps that I like quite a bit, and uploading my notes to github is not something i've been going "damn i wish i had an app that would do that" because anyone who knows about github already knows how to commit their files and push them up...

doing it in gists is even worse (ignoring security aspects) because at least with my manually managed notes their organized in folders, browsable, greppable, etc.