Completely agree that giving previous comp information or comp expectations can only hurt you as an employee. The only thing giving this information will do is provide a company the information they need to pay you less than they might have otherwise.

I think it is difficult for employees to judge what they're truly worth. Therefore, when most people give a number, that number will be lower than what an employer may be willing to pay (and perhaps lower than the company's initial offer would be). I would guess this holds doubly true for graduates of a bootcamp, or recent college graduates, who have less industry experience on which to base their judgment of business value.