The only part that's lost in the comparison is that the U.S. Constitution, its amendments, and its history are public domain. You don't know the terms of the Bioware employee's contract--unless I missed the part where you were employed by EA/Bioware around the same time and would likely have had a near-identical employment contract--so you don't know if the gag rule that you've dreamed up is actually a term of the contract or an unwritten tradition in the industry, kind of like the two-term limit on U.S. Presidents was an unwritten tradition, prior to the ratification of the twenty-second amendment.
Honestly, I've little doubt in my mind that EA/Bioware is an at-will employer who can fire employees and contractors without cause.