It is good that the stolen coins are blacklisted and rendered useless.
However, looking at another point of view, this means the coin is not decentralized enough and the devs have absolute power. This is the same case with central banks marking the serial numbers of stolen money / money laundry service. The coins were stolen because of the lack of security from the exchange, thus the exchange should be responsible, not the dev. Some people have the opinion that this is actually not a good move for crypto world.