Do you think buying it from a street dealer isn’t corporatized? Cartels are basically just black market multinationals at this point. If anything, legalization would make it less corporate since you could grow it in your backyard.
It will seem more corporate once it’s legal, but that’s just because the business is being conducted in daylight.
Source: Canadian who grows a plant or 2 each summer
Natural gas is absolutely not as bad or worse than coal, if you look at the whole picture. The big problem with coal wasn’t the greenhouse emissions, it was all the other emissions. Radioactive particulates anyone?