That's simply breach of contract (or on this case it would be an implied contract). The issue that nobody is addressing is intent. The breach must be made with intent to defraud in order for it to be a scam.

Also, his statement that he would launch 1000 coins and not support any of them takes any implied contract off the table for all subsequent coins (unless he turns around and implies that he will support a particular coin) because he stated up front that he would not support them.

If anybody has significant damages as a result of his actions (or lack thereof) there is probably sufficient grounds for a lawsuit, but there's no grounds for criminal prosecution.