They make sure you consider things like intellectual property rights - ie, are you developing a product that will become the property of the customer (and thus you cease to own the copyright and can never reuse it)

There are also questions of confidentiality and non-disclosure which are neatly covered by PCG contracts without signing your life away. Getting proper T&Cs up front will make you look more professional and they will respect you a lot more as a business.
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