Everything is a remix of other things that look like it. In this case it's the fact that everyone has the same word every day and you can compare how well you did that made it go viral.
I really appreciate you taking your chances and building something for yourself and being able the live off of it is even better. I'd call it "hack your life" ;) and find Timwi's reaction overly negative.
I also share the feeling it could have been a Tell HN instead of a Show HN.
But let's be honest, of course you want to promote your product. It's not a bad thing to admit that.