it's definitely not curb rash as the outermost edge/lip is free on damage.
present day tire mounting machines, such as a Hunter, typically do not touch the part of the rim where damage is shown. if they were using a mounter/dismounter that is more archaic or the installer is not experienced, damage could be caused in a variety of ways.
you can tell the rim was spinning or whatever was scratching it was rotating around the rim.
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