Right now he can claim the moral high ground, even if he is kind of being a jerk about it: "I didn't get paid, but I gave them access to their work anyway! (I j

Right now he can claim the moral high ground, even if he is kind of being a jerk about it: "I didn't get paid, but I gave them access to their work anyway! (I just gave it to some other people, too.)" If you added the proposed restriction, you demonstrate that you will take revenge on deadbeat clients by trying to give their competitors a leg up.