Can someone delete a losing Call?

No. Once a Call becomes part of your verified history, you cannot delete it just because it lost. Wins stay. Losses stay. Your track record is built from what actually happened.

Losing Calls stay

A Call that turns out to be wrong remains part of your verified record.

You cannot remove a bad result to make your performance look better.

Can a Call ever be removed?

Only if it is fraudulent, manipulated or invalid and removed after review.

A genuine Call that simply lost is not removable.

Why does this matter?

Because reputation only means something if the full history is there.

On Tribes, you cannot curate your track record into a version that only shows the wins.