Inspired by these long running offers of money from nowhere the governments weren't going to miss out on such an easy way to generate revenue from thin air. But while the scams rely on fooling a tiny percentage of millions of recipients, the UN set up carbon trading, where by law countries involved must charge over the odds for energy which is then bought and sold to allow traders and associated neerdowells to earn silly amounts of money without creating or adding absolutely anything to the system.
And then, to add insult to injury, if the market discovers (as it recently has in Europe and Chicago) you can't keep it going very long as people can't actually spin straw into gold however much help they get in subsidies to start the machine rolling, the governments go one step further and simply fix the market and use extortion to enforce the price.
The difference between the scams and the carbon trading is at least people choose to pay the scammers. No one chooses carbon taxes but we all have to pay them in Europe.