If that's something that affects 0.001% of business, and if some culprits have been found and punished (for the leaks to come out), then businesses will probably continue using AWS and not caring, thinking "what are the chances"?
Except if something causes direct and measurable money loss, they wont really care, even if it's proven to have hurt this or that other company.
Until the industrial espionage and insider trading leaks come out. Then all hell will break loose.