You can also choose to restrict permissions so an application can only use a sensor while it is actively being used. If an unfamiliar app has no legitimate reason to access your microphone or camera, uninstalling it may be the safest choice.
Ultimately, the green dot is meant to provide reassurance rather than fear. It gives you visibility into what your phone is doing and allows you to investigate unexpected activity. Once understood, this tiny indicator becomes an important privacy safeguard that helps keep control of your camera, microphone, and personal information in your hands.
