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@spotter
A heavily worn rim can definitely fail without braking being applied.
The wall thickness is diminished, the rim is weaker, you can hit a bump and the change in tyre pressure (or hitting something so hard you hit the rim) can blow the side wall out of the rim. Or you could just be pumping you tyre up and it'll go. I've seen both on heavily worn rims, as others have said it all depends how worn it is.