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Consultants sometimes dislike NDA, because as a consultant, you are already expected not to disclose. It is strongly implied, like patient-confidentiality. Airing dirty laundry or competitive advantage as someone visiting many companies a year, is like a doctor amputating the wrong leg. You do this once, then you are out of a job and reputation.

Risk is on your end, so you pay for it. A 10k contract becomes a 12k contract. You clarify your risks, your mitigation method (NDA), and that the extra money is for the legal liability the consultant takes on.