You could qualify that with "at the level of infrastructure" and it would be very close to true. Yahoo wasn't public cloud. Their infra has long been a sieve.

You could qualify that with "at the level of infrastructure" and it would be very close to true. Yahoo wasn't public cloud. Their infra has long been a sieve. Linkedin was an application issue. iCloud is the strongest case of these three, but they had weak user-facing authentication for a consumer service (most users were unaffected).