Did Yahoo breach Verizon’s trust?

As Yahoo belatedly confirms a massive historical data breach two questions spring to mind; who knew Yahoo even had 500 million users, and what does this mean for the Verizon acquisition?
Even at this time of data breach fatigue Yahoo has set the standard for how not to protect your customer’s data. The company announced yesterday that at least 500 million users had their accounts accessed and details stolen.
“A recent investigation by Yahoo has conf