Sir your assumptions are your own. If you don't trust it, don't use it, but that's unfair and physically impossible for you to make any claim to the services credibility if you've never used it.
Don't worry, I won't use it. 
But I will also warn everybody else (specially the newbies who don't understand things) how unsafe and untrustworthy this is.
Now, if you are legit, shutdown your service right now and only put it back when you implement a safe way of generating vanity addresses (split-key).