Could not LinkedIn use a scheme where the first five hundred accesses a month are free, and then ramp up the cost for subsequent accesses? That way they can set the threshold for what they consider "legitimate" user of their service by number of free accesses and then ramp up the cost as they see fit?

Can they make an EULA requirement that prohibits re-sale of data and derivative works? Usage restrictions that the data can only be used for hiring purposes?

... the way they bought The All-Seeing Eye (Yes, I am that old) and then put it to the sword. I never even got the refund for my life time license.