Some don’t even need to. EasyAntiCheat and BattlEye both have support for Linux and it’s up to the devs to enable support (or upgrade to a version that supports Linux). But in some cases, the companies just refuse to support it (Bungie with Destiny 2 for example)

Download the TestFlight app then open the link and press Start Testing. It should open in TestFlight and ask if you want to join the test group then let you download the app