I think that if you really care about privacy and security then the simplest way to ensure that a game can't harm you is to avoid handling anything important on

I think that if you really care about privacy and security then the simplest way to ensure that a game can't harm you is to avoid handling anything important on your gaming PC. If you think they might do something malicious, not having admin rights won't prevent that game from reading all your authentication credentials from your browser, for example.