Well taxing their own crypto is going to be pretty easy, since the rules are going to be etched in stone within their protocol. Therefore, they have financial incentive to use this cryptocurrency since it makes tax collection way easier.

However, what advantages will this cryptorouble have? Even if they are the first to launch it, doesn't mean the idea is any good at all. It is not even decentralized, they are merely using blockchain tech to collect tax.