[codemusings]

It wasn't obvious at all to me that that's even possible. But as it turns out: it's an accessibility feature (1) to mirror the watch screen on iPhone in order to voice control it or use assistive touch.

1: https://support.apple.com/guide/watch/apple-watch-mirroring-...

[caleb-allen]

Surely this is a vector for attack then?

[planb]

No. You need to gain access to the phone. If you have access to the phone, the watch isn’t interesting anymore.