Typo: "Not only will know one know who it was but you will be hidden behind a random animal! This is our way of guarantying 100% anonymity."
Fixed - Thank you!
I would be careful about "guaranteeing 100% anonymity" too. I think that would very quickly not be the case should law enforcement get involved after your service is used to send threatening messages to someone it shouldn't.
Ya pretty much don't ever use this app if you actually want to be anonymous. DM's are logged and I really doubt the author would not comply if the Feds came knocking.
It would not even be up to the author, Twitter would have the data and could provide this to authorities.