Those are not real crypto-currencies. Those are just digital versions of the fiat currency, similar to Paypal or Skrill. A crypto-currency should be decentralized. It can't be issued by any central bank.
Cryptocurrency are mainly decentralised in nature. If any government issued it then it lost its decentralised nature. The cryptocurrency become under control of government term and conditions and turns into a. Centralize currency. If that happens it have both positive and negative effects. Positive effects like its volatile will be decrease and it become more stable and investor suffer less investmental crisis. But the negative effect is their is no freedom to user in their cryptocurrency job.