Not all blockchains require decentralization. There is a nice mapping between immutable ledgers and accounting. Using an open source technology also seems like a win for governments who are notoriously bad procuring software.
Banks, governments, and even Facebook continue to come up with "federated blockchains", boasting fast transaction times and private data, but butchered consensus mechanisms.
At the end of the day, they are using an expensive database that in some way or other defeats the point of using a blockchain.
It's not as if public-permissionless blockchains are all that decentralized, so the bar is pretty low on that measure.