The fact is, most companies are fine to let an existing system run rather than replace it with one that has a cheaper consumable thing, provided they can still get that consumable and the cost of replacing that system is high.

Basically, corps would have kept buying and using CFCs because replacing the refrigeration system is too costly.

Not only was an alternative found that was cheaper and safer and almost as good (as effective), but scientists and engineers put in the effort to find ways to adapt existing systems to the new working fluid. All for significantly less than replacing the system.

Not only was a replacement found, but it was made economically viable for widespread deployment in a very short timeframe; not just having a short development time, but also a very short duration to deploy the new solution to an existing system.

You're right, that it was cheaper and everything, but most of the time changing the working fluid of a refrigerator/air conditioning unit, will require that the system is replaced. They worked around that. Additionally, you're correct that it was industry that made the change and pushed it to their clients.

I just want to make sure we recognise the efforts put in by the scientists and engineers that enabled the rapid switch to non-CFC based cooling systems. It's still an amazing achievement IMO, and something that required a remarkable amount of cooperation by people who probably don't cooperate often or at all (and are, in all likelihood, fairly hostile to eachother, most of the time).

IMO, that's still one of the best examples of global cooperation that anyone could possibly point to. Rarely do we have a problem where there's almost universal consensus on the issue and how to fix it. In this case, there was. That level of cooperation among the people of earth is borderline unparalleled; the only other times we cooperated this well that people would know about are usually negotiations done with the barrel of a gun. Namely the world wars. One group said that we're going to do a thing, another group said nope. It was settled with lives, bullets and bombs, and nearly every person alive was on one side or the other.... Except Sweden, I suppose... And maybe smaller countries that didn't have enough of an army to participate. (I'm sure there's dozens of reasons, but I'm not a historian)

Without guns, bombs, or even threats, just a presentation of the facts and a proposal for a solution, everyone just .... went along with it.

To me, that's unprecedented.