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For The Witness, there was a fix which was found (I don't know if it can work on other games that doesn't work in your case) :if you go into the game application into the finder (you can access it through steam if you click on Manage > Browse local files) and you try to open it, you should see a pop up which says the game is damaged, if you try again while holding the option button you should be able to let it run anyways
Edit :here is another post which says basically the same thing but in case my explanations are difficult to understand https://steamcommunity.com/app/210970/discussions/0/3470612993467716223/
The problem is that macOS doesn't say the app is damaged but that it "quit unexpectedly". I tried this solution with The Witness and no luck