Apple presumably knows their own apps aren't malware? If Apple wants to record your screen they don't need to use Quick Time Player to do it. They can bake it

Apple presumably knows their own apps aren't malware? If Apple wants to record your screen they don't need to use Quick Time Player to do it. They can bake it into the firmware. If you don't trust Apple not to randomly record with Quick Time Player, you shouldn't be using macOS.