If you know for sure you have been infected with malware then it’s better to reinstall. But on iOS/Android and any other OS with strong boot chain security you

If you know for sure you have been infected with malware then it’s better to reinstall. But on iOS/Android and any other OS with strong boot chain security you can proactively reboot your device periodically and wipe out malware you weren’t aware of. It’s borderline impossible to persist malware across reboots on iOS these days.