Article says (with caveats) that Canada, Sweden, and Austraila are the early adopters.

Of these I'm only familiar with Canada, in which the economy revolves entirely around government spending, with a few quasi-government oligopolies thrown in (banks and utilities that also have effective taxation power). This kind of administration heavy system is exactly where these ideas proliferate. They are all about exerting power over others, and in a bureaucracy that's disconnected from the real world they are a great way to jockey for power, so it's not surprising to see canada as a leader. No idea if this holds for the other two.