A game is only as good as its creators. Therefore, it is in the interest of game development companies to keep their staff happy, so they don’t even think about switching to the competition. In addition, however, it is worth taking preventive measures, e.g. including clauses in contracts preventing the poaching of valuable employees and independent contractors.
Sometimes, regardless of the industry, companies include clauses in contracts preventing actions unfavourable to them. The most common of such clauses ban: