The question that always remains in cases like this: Would they have handled it this well if their target wasn't as well known as SymPy?

This could just be another case of a problem being solved by hitting the news and making enough waves.

Sure they did the right thing, but it was still their active wrongdoing and I won't attribute their reaction to them being decent people. I'm tired of all the DMCA abuse, and reverting it for once isn't worthy of special praise. It makes HackerRank better than other DMCA abusers, but DMCA abusers they still are.