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This is probably a shake to report a bug feature (Android users are probably more used to this, I remember Google Maps on Android having this feature)

Is there some reason to implement it on iOS? It also is really damn touchy.

Smaller codebase? I expect the iOS and Android branches share a fairly decent amount of code.

This is a pretty common pattern on Android. Sometimes accompanied by a message like "You seem to be shaking the device in frustration, report a bug?"

Where the response from me has always been, "No, I wasn't frustrated, I was running. But now I'm frustrated."

Onedrive on ios has a “shake to send feedback” but it can be disabled on the onedrive’s setings menu. I cant see the same on vlc and i couldnt reproduce the effect. maybe its the version you have? it may share some framework or library with this feature enabled by default (pure speculation i admit).