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Do you think those individuals will see the difference?No more or less than an individual whose home was not robbed because a crime was prevented unbeknownst to them.
However, I believe that the toxic data hoarding companies collectively don't see any difference, and so they don't care if individuals suffer. The suffering of individuals when data is leaked is an externality, and it is only when forced to pay for that externality that companies would start to care.
In this regard, the black hats and the toxic data hoarders both contribute towards undermining the common good. Companies don't care if money disappears mysteriously from the bank accounts of individuals who happen to be their customers — companies just don't want to be embarrassed, as it isn't their money being stolen.
But the grey hats disrupt this state of affairs. They are truly antagonistic to the toxic data hoarders, because they humiliate them, rather than merely use them to steal from somebody else.
This status quo of companies operating unsafely, creating massive but dispersed and plausibly deniable harm, is perfectly legal. But should the public trust these companies? Should the public trust individuals who work hard at these companies to build toxic data stockpiles and cover up intrusions, rather than those who expose the harms these practices bring? Who are the "good guys"?