I hear about government "sponsored" (controlled) cyber currency from time to time and I have to tell people that it's not a good idea. Most of the time I focus on things like "inflation", "currency debasement" and of course "this money can only be spent on these things we will allow you to buy".
I don't even consider the really weird stuff like "This money expires on xxxx", or "We can take this money back from you at our discretion". That is where stuff really gets creepy. I mean it's my labor that I am getting paid for, but I'm getting paid in a currency that can be taken away from me on a whim?
Fuck that noise. At least with paper dollars they have to send a thug with a truncheon to get it from me.