Only problem with crypto is it's so difficult for governments to tax. They basically have to ask permission to tax it... which kind of defeats of the purpose of a tax if the majority of people are just going to opt-out.

And no government is going to accept auto-taxes collected from illegal stuff (or stuff they don't approve of) being sold, because that would be admitting they can no longer control the economy. If England or America accepted automatic payment from a 3rd party crypto-currency they couldn't control the entire world's economy would shift over night. Billionaires would be created and destroyed within hours. That kind of rapid-paced economy could bankrupt a country without warning if enough politicians went full retard at once... and because humans are humans, that risk is a very valid possibility.

Currency has been, and always will be, a tool used by governments to steal wealth. It's why art works so well. It uses the age-old method of bartering. Favor for a favor with a banana to legalize it.