Companies don’t feel that way. They feel they can just ramp up the workload on existing employees “until we can hire more.” What are they going to do, leave? Where do they think they’re going to go? They’ll be met with the same situation at another company, except they’ll be on the other side of the table this time.
If there are companies with money, no employees, and the urgent desire to hire them, that breaks this equilibrium. The overworked employees jump ship to the startup, the incumbents become more desperate and finally relent.