What I thought this was, and what would be fascinating, is a tool that you give both the post and context, and it predicts the response and posts it at the idea

What I thought this was, and what would be fascinating, is a tool that you give both the post and context, and it predicts the response and posts it at the ideal time. This could work by training an ML algorithm over the reddit corpus (especially the contextually relevant stuff -- the subreddit) and metadata (including post time, among many other factors). Even more impressively, it could suggest modifications, ala crystalknows.com. Does anything like this currently exist?