There is morality, and there is law. BeeMe is most certainly illegal in several jurisdictions under intellectual property law (which I personally believe to be pointless and immoral), and there are questions we could ask about that... who runs it? Who is breaking the law? Is the law enforceable? Will that person be sued?
None of those have anything to do with morality, unless you believe that breaking the law is inherently immoral, in which case we'd have to have some ugly discussions about some of our favourite civil rights heroes. Instead, I propose that this is one of many cases in which morality diverges from legality.
There was a service available for the Steem community. The Steem community moved to Hive; the creator of that service did not. The publicly available code, which is just data on a server, was taken, picked apart, and hooked up to give information about Hive instead of Steem.
In my eyes, neither the maintainer of this service or anyone using it have done anything to injure anyone. @steemchiller has repeatedly made it clear that he has no interest in developing on Hive, so someone else stepped in to offer a free service. He is very clearly credited at the bottom of the page for his work.
I don't see a moral issue.