It’s not “becoming” a business. It’s been a business all along - one based on a scam.
The carbon racket was initiated by infamous Enron. They were trading sulfur credits and looked for a way to increase their market, since carbon is much more prevalent than sulfur, even tho carbon dioxide is actually the stuff of all life on Erf (No CO2, no vegetation, no food for animals like cows, sheep, no food for humans, erf just a lump of rock)