I heard that in Japan phones have an audible shutter sound. Not mandated by law. Though I think that having this in the law is very reasonable. Maybe EU can step up. Taking photos is more fun with the sound too.

It’s not one law but it’s essentially a collaborative result of ordinances, manufacturers, and telecom carriers.

https://japandaily.jp/why-you-cant-turn-off-the-camera-shutt...