Hasn't this happened a couple of times in the last year
Yep! But usually with solo mining, a winner's hashrate is much higher.
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I thought they just got lucky
Definitely an element of luck involved, but if you deploy 1 Petahash, mine to a solo pool (like CKPool), and are willing to wait a year (especially during the bear market), you tend to be "luckier" than those who aren't putting in the effort!