Market dumps into thin books on a single fiat exchange (Bitstamp, Coinbase Pro, Kraken) are always oracle attacks (b/c a best-execution oriented seller would simply sell across all venues over a window).
Perhaps time to discuss what safeguards these exchanges should consider.
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Oracles are only responsible for reporting the truth, not for controlling events or even what people do with the truth. To spot exchanges, the behavior is neither good nor bad. A robust index, like is much less vulnerable to being influenced by a market anomaly.
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So, it is not so much an attack on the oracle as it is the exploitation of a naive counter party. The sucker accepted an unknown, variable price, which turns out could, under the terms, be set by the other contract participant. Oops. Not the oracle's fault.
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No. Exchanges can't control what things people will do with publicly available data any more than Twitter can. People can make a bet on anything and the unwitting subject of that bet should never have any obligation to the betters. Smart and dumb contracts both need security.