Bitcoin history: exploit leads to soft fork.
Nobody argued that the transaction was valid because the code allowed it to occur. It was a bug and they fixed it.
https://decrypt.co/39750/184-billion-bitcoin-anonymous-creator
pretty much the only time the Bitcoin network was substantially exploited
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This one was pretty serious compared to a spam attack.
And likely happens to altcoins all the time. Many undiscovered/hidden. Probably happened, is happening, and will happen to ethereum, monero.