What if such an open APIs cause a loss to the business, is it still legal? Coz then intent can be thought of as a bad one? Edit: people are assuming too much a

What if such an open APIs cause a loss to the business, is it still legal? Coz then intent can be thought of as a bad one? Edit: people are assuming too much about my intent of this question and downvoting, I was just curious, moreover a good answer to this will make the case stronger against Instagram/Fb.