There were viable alternatives to CFCs, and relatively few companies produced and used them.

Almost everyone uses fossil fuels, and the alternatives are still problematic:

Solar and wind are intermittent and only work economically in certain areas (requiring transmission upgrades and storage capacity).

Nuclear is very expensive (outside of France) and slow to build out.

It’s much easier to regulate a few dozen companies than to tax carbon in hundreds of countries at different stages of development.