Depends also how the specific game is implemented, but often that area is just black and inaccessible, as in you cannot even move the cursor there. It is as if the screen does not include the area above the notch anymore, ie how the screen would be if there was no notch, like the m1 air.
Thanks for explaining! I see this is common then. If I'm understanding correctly the docs of NSPrefersDisplaySafeAreaCompatibilityMode[1], this is supposed to be a compatibility mode that apps can opt-out of to behave like I expected, and can be force-disabled from Finder.
So I guess rendering around the notch is the intended experience, but devs don't seem to know or care enough to opt-out, and the bug here is that enumerating display resolutions doesn't take this compatibility mode into account.
Depends also how the specific game is implemented, but often that area is just black and inaccessible, as in you cannot even move the cursor there. It is as if the screen does not include the area above the notch anymore, ie how the screen would be if there was no notch, like the m1 air.