Just to leave absolutely nothing up to interpretation here as to how automatic exploit protection compatibility mode works, and which apps work with it, this is how:
https://github.com/GrapheneOS/platform_packages_apps_AppCompatConfig
This little app (which is just a text config file) is updated via the "Apps" app. You'll find it if you look at all the packages there.
It helps both enable additional, optional exploit protections for select apps, as well as reduce some for others, depending what they need. In the future, more popular apps will be added to this list.
It has nothing to do with your installed apps, AppCompatConfig just has a predefined amount of apps that it works with.