If you work for a corporation, you already are prevented from using your brain and mouth as you see fit (or at least, what you "see fit" is being heavily influe

If you work for a corporation, you already are prevented from using your brain and mouth as you see fit (or at least, what you "see fit" is being heavily influenced by your desire to stay employed by them). Consumer privacy regulations don't control your brain and mouth, they control the incentives of companies, who are not humans, and do not have mouths or brains. Those companies then control the incentives of their employees who can choose whether or not to work for them.