Many games rarely update, though. They put out the original version, and then maybe a few patches to fix game-breaking bugs, and then that's how they exist from then on. If you're expecting them to update to address vulnerabilities, you're going to be very disappointed.

That said, if the library changes the API or functionality at all, dynamic linking is going to break the game, and that's not good either. So gamedevs are going to opt for static linking and call it a day rather than deal with support requests.