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Wow, that's an odd failure. Be curious to get some more info from @shanerrs on how it could have been hit/stressed.
That's the rear of the receiver with the crack, correct? Maybe he was towing something heavy that got very unblanced and exerted a LOT of upwards pressure on the front of the hitch, causing and extreme pivot to the back of the pitch. Like backing a trailer up an extreme angle or something. Still shouldn't fail, but informative to know it is possible and what setup caused it (lotta play in the trailer, excessive length on front or back of the receiver, ...? just wild guesses)
That is an odd failure mode. Hard to imagine that area being particularly stressed. Was this new when you bought it?
shanerrs, if you're looking for a replacement let me know. I've got one very cheap!