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The blown call the question refers to was a controversial no-call for blatant defensive pass interference on a third-and-10 for the New Orleans Saints at the Los Angeles 13-yard line during the Conference championship game. An L.A. Rams cornerback initiated contact with the New Orleans Saints receiver while the pass was on its way to him.
The penalty would almost certainly have changed the outcome of the game in favor of the Saints, but the no-call allowed the Rams to win and proceed to the Super Bowl.
We can't say exactly how often this occurs, but we can say that in the new sports betting environment, "righteous refunds" such as this are pretty much the en vogue marketing move for the start-up sports books.
Certainly in this case, it did make headlines for PointsBet.