If you do you can see clearly why they haven't been able to cure it.
And it's largely because there is no 'it'
There's no such thing as the common cold - it's just a catchall term for many infections that tend to have similar symptoms.
There are over 200 variations from 7 different virus families (coronavirus being one of them).
That's why sometimes you get a sore throat and sometimes not. Sometimes you get a bad dry cough and other times a reproductive cough. Etc, etc.
You alluded to this whole thing being a way of generating money for big Pharma. Well, why wouldn't they produce a cold cure?
There is a Nobel Prize and a truck full of cash to the person/team who develop the cure.
And the country who developed it would bask in adulation for decades. After they had patented it that is.
There is nothing either good or bad, but thinking makes it so.