I think OP comes across as a bit of an asshole. They send a fairly confrontational email and didn't even wait for a response before taking their dirty laundry to Twitter.

I disagree with Ghost taking down the site without more discussion, but I do think their original practice of giving the user the benefit of the doubt and allowing the use of upgraded features without upfront payment to be generally good. I think OP's complaint could probably be addressed through the UI (though I don't know what that looks like presently).